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Everyone has at least heard what mass is, and has some intuitive understanding of it. Almost everything has mass, me, you, your house, and the Earth. It's important to know more than just the basics of mass, as so many different formulas and definitions in the field of physics require knowledge on it, as they may very well make use…

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Mass in Physics

- Astrophysics
- Absolute Magnitude
- Astronomical Objects
- Astronomical Telescopes
- Black Body Radiation
- Classification by Luminosity
- Classification of Stars
- Cosmology
- Doppler Effect
- Exoplanet Detection
- Hertzsprung-Russell Diagrams
- Hubble's Law
- Large Diameter Telescopes
- Quasars
- Radio Telescopes
- Reflecting Telescopes
- Stellar Spectral Classes
- Telescopes
- Atoms and Radioactivity
- Fission and Fusion
- Medical Tracers
- Nuclear Reactors
- Radiotherapy
- Random Nature of Radioactive Decay
- Thickness Monitoring
- Circular Motion and Gravitation
- Applications of Circular Motion
- Centripetal and Centrifugal Force
- Circular Motion and Free-Body Diagrams
- Fundamental Forces
- Gravitational and Electric Forces
- Gravity on Different Planets
- Inertial and Gravitational Mass
- Vector Fields
- Conservation of Energy and Momentum
- Dynamics
- Application of Newton's Second Law
- Buoyancy
- Drag Force
- Dynamic Systems
- Free Body Diagrams
- Normal Force
- Springs Physics
- Superposition of Forces
- Tension
- Electric Charge Field and Potential
- Charge Distribution
- Charged Particle in Uniform Electric Field
- Conservation of Charge
- Electric Field Between Two Parallel Plates
- Electric Field Lines
- Electric Field of Multiple Point Charges
- Electric Force
- Electric Potential Due to Dipole
- Electric Potential due to a Point Charge
- Electrical Systems
- Equipotential Lines
- Electricity
- Ammeter
- Attraction and Repulsion
- Basics of Electricity
- Batteries
- Capacitors in Series and Parallel
- Circuit Schematic
- Circuit Symbols
- Circuits
- Current Density
- Current-Voltage Characteristics
- DC Circuit
- Electric Current
- Electric Generators
- Electric Motor
- Electrical Power
- Electricity Generation
- Emf and Internal Resistance
- Kirchhoff's Junction Rule
- Kirchhoff's Loop Rule
- National Grid Physics
- Ohm's Law
- Potential Difference
- Power Rating
- RC Circuit
- Resistance
- Resistance and Resistivity
- Resistivity
- Resistors in Series and Parallel
- Series and Parallel Circuits
- Simple Circuit
- Static Electricity
- Superconductivity
- Time Constant of RC Circuit
- Transformer
- Voltage Divider
- Voltmeter
- Electricity and Magnetism
- Benjamin Franklin's Kite Experiment
- Changing Magnetic Field
- Circuit Analysis
- Diamagnetic Levitation
- Electric Dipole
- Electric Field Energy
- Magnets
- Oersted's Experiment
- Voltage
- Electromagnetism
- Electrostatics
- Energy Physics
- Big Energy Issues
- Conservative and Non Conservative Forces
- Efficiency in Physics
- Elastic Potential Energy
- Electrical Energy
- Energy and the Environment
- Forms of Energy
- Geothermal Energy
- Gravitational Potential Energy
- Heat Engines
- Heat Transfer Efficiency
- Kinetic Energy
- Mechanical Power
- Potential Energy
- Potential Energy and Energy Conservation
- Pulling Force
- Renewable Energy Sources
- Wind Energy
- Work Energy Principle
- Engineering Physics
- Angular Momentum
- Angular Work and Power
- Engine Cycles
- First Law of Thermodynamics
- Moment of Inertia
- Non-Flow Processes
- PV Diagrams
- Reversed Heat Engines
- Rotational Kinetic Energy
- Second Law and Engines
- Thermodynamics and Engines
- Torque and Angular Acceleration
- Famous Physicists
- Fields in Physics
- Alternating Currents
- Capacitance
- Capacitor Charge
- Capacitor Discharge
- Coulomb's Law
- Electric Field Strength
- Electric Fields
- Electric Potential
- Electromagnetic Induction
- Energy Stored by a Capacitor
- Equipotential Surface
- Escape Velocity
- Gravitational Field Strength
- Gravitational Fields
- Gravitational Potential
- Magnetic Fields
- Magnetic Flux Density
- Magnetic Flux and Magnetic Flux Linkage
- Moving Charges in a Magnetic Field
- Newton’s Laws
- Operation of a Transformer
- Parallel Plate Capacitor
- Planetary Orbits
- Synchronous Orbits
- Fluids
- Absolute Pressure and Gauge Pressure
- Application of Bernoulli's Equation
- Archimedes' Principle
- Conservation of Energy in Fluids
- Fluid Flow
- Fluid Systems
- Force and Pressure
- Force
- Conservation of Momentum
- Contact Forces
- Elastic Forces
- Force and Motion
- Gravity
- Impact Forces
- Moment Physics
- Moments Levers and Gears
- Moments and Equilibrium
- Pressure
- Resultant Force
- Safety First
- Time Speed and Distance
- Velocity and Acceleration
- Work Done
- Fundamentals of Physics
- Further Mechanics and Thermal Physics
- Bottle Rocket
- Charles law
- Circular Motion
- Diesel Cycle
- Gas Laws
- Heat Transfer
- Heat Transfer Experiments
- Ideal Gas Model
- Ideal Gases
- Kinetic Theory of Gases
- Models of Gas Behaviour
- Newton's Law of Cooling
- Periodic Motion
- Rankine Cycle
- Resonance
- Simple Harmonic Motion
- Simple Harmonic Motion Energy
- Temperature
- Thermal Equilibrium
- Thermal Expansion
- Thermal Physics
- Volume
- Work in Thermodynamics
- Geometrical and Physical Optics
- Kinematics Physics
- Air Resistance
- Angular Kinematic Equations
- Average Velocity and Acceleration
- Displacement, Time and Average Velocity
- Frame of Reference
- Free Falling Object
- Kinematic Equations
- Motion in One Dimension
- Motion in Two Dimensions
- Rotational Motion
- Uniformly Accelerated Motion
- Linear Momentum
- Magnetism
- Ampere force
- Earth's Magnetic Field
- Fleming's Left Hand Rule
- Induced Potential
- Magnetic Forces and Fields
- Motor Effect
- Particles in Magnetic Fields
- Permanent and Induced Magnetism
- Magnetism and Electromagnetic Induction
- Eddy Current
- Faraday's Law
- Induced Currents
- Inductance
- LC Circuit
- Lenz's Law
- Magnetic Field of a Current-Carrying Wire
- Magnetic Flux
- Magnetic Materials
- Monopole vs Dipole
- RL Circuit
- Measurements
- Mechanics and Materials
- Acceleration Due to Gravity
- Bouncing Ball Example
- Bulk Properties of Solids
- Centre of Mass
- Collisions and Momentum Conservation
- Conservation of Energy
- Density
- Elastic Collisions
- Force Energy
- Friction
- Graphs of Motion
- Linear Motion
- Materials
- Materials Energy
- Moments
- Momentum
- Power and Efficiency
- Projectile Motion
- Scalar and Vector
- Terminal Velocity
- Vector Problems
- Work and Energy
- Young's Modulus
- Medical Physics
- Absorption of X-Rays
- CT Scanners
- Defects of Vision
- Defects of Vision and Their Correction
- Diagnostic X-Rays
- Effective Half Life
- Electrocardiography
- Fibre Optics and Endoscopy
- Gamma Camera
- Hearing Defects
- High Energy X-Rays
- Lenses
- Magnetic Resonance Imaging
- Noise Sensitivity
- Non Ionising Imaging
- Physics of Vision
- Physics of the Ear
- Physics of the Eye
- Radioactive Implants
- Radionuclide Imaging Techniques
- Radionuclide Imaging and Therapy
- Structure of the Ear
- Ultrasound Imaging
- X-Ray Image Processing
- X-Ray Imaging
- Modern Physics
- Bohr Model of the Atom
- Disintegration Energy
- Franck Hertz Experiment
- Mass Energy Equivalence
- Nuclear Reaction
- Nucleus Structure
- Quantization of Energy
- Spectral Lines
- The Discovery of the Atom
- Wave Function
- Nuclear Physics
- Alpha Beta and Gamma Radiation
- Binding Energy
- Half Life
- Induced Fission
- Mass and Energy
- Nuclear Instability
- Nuclear Radius
- Radioactive Decay
- Radioactivity
- Rutherford Scattering
- Safety of Nuclear Reactors
- Oscillations
- Energy Time Graph
- Energy in Simple Harmonic Motion
- Hooke's Law
- Kinetic Energy in Simple Harmonic Motion
- Mechanical Energy in Simple Harmonic Motion
- Pendulum
- Period of Pendulum
- Period, Frequency and Amplitude
- Phase Angle
- Physical Pendulum
- Restoring Force
- Simple Pendulum
- Spring-Block Oscillator
- Torsional Pendulum
- Velocity
- Particle Model of Matter
- Physical Quantities and Units
- Converting Units
- Physical Quantities
- SI Prefixes
- Standard Form Physics
- Units Physics
- Use of SI Units
- Physics of Motion
- Acceleration
- Angular Acceleration
- Angular Displacement
- Angular Velocity
- Centrifugal Force
- Centripetal Force
- Displacement
- Equilibrium
- Forces of Nature Physics
- Galileo's Leaning Tower of Pisa Experiment
- Inclined Plane
- Inertia
- Mass in Physics
- Speed Physics
- Static Equilibrium
- Radiation
- Antiparticles
- Antiquark
- Atomic Model
- Classification of Particles
- Collisions of Electrons with Atoms
- Conservation Laws
- Electromagnetic Radiation and Quantum Phenomena
- Isotopes
- Neutron Number
- Particles
- Photons
- Protons
- Quark Physics
- Specific Charge
- The Photoelectric Effect
- Wave-Particle Duality
- Rotational Dynamics
- Angular Impulse
- Angular Kinematics
- Angular Motion and Linear Motion
- Connecting Linear and Rotational Motion
- Orbital Trajectory
- Rotational Equilibrium
- Rotational Inertia
- Satellite Orbits
- Third Law of Kepler
- Scientific Method Physics
- Data Collection
- Data Representation
- Drawing Conclusions
- Equations in Physics
- Uncertainties and Evaluations
- Space Physics
- Thermodynamics
- Heat Radiation
- Thermal Conductivity
- Thermal Efficiency
- Thermodynamic Diagram
- Thermodynamic Force
- Thermodynamic and Kinetic Control
- Torque and Rotational Motion
- Centripetal Acceleration and Centripetal Force
- Conservation of Angular Momentum
- Force and Torque
- Muscle Torque
- Newton's Second Law in Angular Form
- Simple Machines
- Unbalanced Torque
- Translational Dynamics
- Centripetal Force and Velocity
- Critical Speed
- Free Fall and Terminal Velocity
- Gravitational Acceleration
- Kinetic Friction
- Object in Equilibrium
- Orbital Period
- Resistive Force
- Spring Force
- Static Friction
- Turning Points in Physics
- Cathode Rays
- Discovery of the Electron
- Einstein's Theory of Special Relativity
- Electromagnetic Waves
- Electron Microscopes
- Electron Specific Charge
- Length Contraction
- Michelson-Morley Experiment
- Millikan's Experiment
- Newton's and Huygens' Theories of Light
- Photoelectricity
- Relativistic Mass and Energy
- Special Relativity
- Thermionic Electron Emission
- Time Dilation
- Wave Particle Duality of Light
- Waves Physics
- Acoustics
- Applications of Ultrasound
- Applications of Waves
- Diffraction
- Diffraction Gratings
- Doppler Effect in Light
- Earthquake Shock Waves
- Echolocation
- Image Formation by Lenses
- Interference
- Light
- Longitudinal Wave
- Longitudinal and Transverse Waves
- Mirror
- Oscilloscope
- Phase Difference
- Polarisation
- Progressive Waves
- Properties of Waves
- Ray Diagrams
- Ray Tracing Mirrors
- Reflection
- Refraction
- Refraction at a Plane Surface
- Resonance in Sound Waves
- Seismic Waves
- Snell's law
- Spectral Colour
- Standing Waves
- Stationary Waves
- Total Internal Reflection in Optical Fibre
- Transverse Wave
- Ultrasound
- Wave Characteristics
- Wave Speed
- Waves in Communication
- X-rays
- Work Energy and Power
- Conservative Forces and Potential Energy
- Dissipative Force
- Energy Dissipation
- Energy in Pendulum
- Force and Potential Energy
- Force vs. Position Graph
- Orbiting Objects
- Potential Energy Graphs and Motion
- Spring Potential Energy
- Total Mechanical Energy
- Translational Kinetic Energy
- Work Energy Theorem
- Work and Kinetic Energy

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Jetzt kostenlos anmeldenEveryone has at least heard what mass is, and has some intuitive understanding of it. Almost everything has mass, me, you, your house, and the Earth. It's important to know more than just the basics of mass, as so many different formulas and definitions in the field of physics require knowledge on it, as they may very well make use of this variable. So what is mass, and what can we learn about it?

Mass describes how much matter something or someone is made up of. Mass can also be defined as the amount of inertia an object will have, which is the value of how resistant it is to a change in velocity, and as a result, a change in acceleration, as acceleration is a rate of change of velocity.

We know that the more matter something or someone has, the harder it is to move. This works the same with mass, the more mass something has the more force needed to be applied to move that mass. Almost everything in existence has mass, from objects as massive as a star to objects as tiny as an atom, all of these and everything in between have mass.

An example of something in the universe that does not have mass is a photon, which is a particle of light.

Mass has many different units, including pounds$\text{(lbs)}$, tons$\left(\text{T}\right)$, and grams$\left(\text{g}\right)$; however, the most widely used measurement for mass is the kilogram$\left(\mathrm{kg}\right)$. The kilogram is defined as the official unit of mass by the International System of Units, which defines the SI units. The kilogram is one of the seven base units that make up the rest of the SI units.

Up until 2019, the official measurement of a kilogram was defined by a very specifically weighed cylinder of metals, which was called the “International Prototype Kilogram”. This cylinder was the one true object on the planet that was exactly a kilogram!

Now, we base it on a constant value known as the Planck constant, which is $6.626\xb7{10}^{-34}\raisebox{1ex}{$\mathrm{kg}{\mathrm{m}}^{2}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$. This value is used alongside sensitive equipment to determine a more accurate and consistent definition of$\text{1 kg}$.

There has often been some confusion about mass; particularly, what is different between mass and weight. We said earlier that the more mass something has, the more force is needed to move it. Weight can be explained as a value that describes the force the gravitational pull of the Earth has on mass. At the same time, weight can also be described by the force any gravitational pull has on mass, meaning that if you were to go to a different planet, your mass would stay the same, but your weight would change! The weaker the gravitational pull of the planet or celestial body (such as the Moon), the less you would weigh if you were standing on it. This is why when astronauts were on the moon, they have to bounce along the surface, gravity isn’t pushing down on them as much.

The gravitational pull acting on an object or person has a direction, directly down towards the center of the planet or celestial body. This means weight has both magnitude (a quantifiable value) as well as direction. This makes it a vector, whereas mass, which only has a magnitude, is a scalar quantity.

We just mentioned that your mass would stay the same no matter which planet you were on. This is however true in all cases, the mass of any object or person will never change no matter what. This is known as the principle of Conservation of Mass. In more detailed terms, it also states that if an object were to be taken apart, the total mass of that object would be divided exactly within all of its parts, and if they were to be put together again, the sum of all of those parts would equal the mass of the initial object exactly.

Mass has a few different ways to be calculated depending on the information that we have at our disposal. One of the primary equations we need to be concerned with is the following:

$m=\rho V$

Where$m$is the mass,$\rho $is the density, and$V$is the volume.

Density defines how much of something there is inside a specific amount of space. Therefore, the denser something is, the heavier it is. For example, imagine we had a ton of feathers and a ton of steel. They both have the same mass, but steel is a lot denser than feathers, so that means that way more feathers are needed than steel to make up that ton. At the other end of the spectrum, volume is quite straightforward. Volume is used to define the amount of space something fills.

Density is typically measured in kilograms per cubic meter (${\text{kg/m}}^{3}$), and volume is typically measured in meters cubed (${\text{m}}^{3}$).

We’re now going to look at how this equation may be used in a few different circumstances with some examples, so you’ll know what to look out for and how to solve them:

A box has a volume of$5.2{\mathrm{m}}^{3}$and a density of$15.0\raisebox{1ex}{$\mathrm{kg}$}\!\left/ \!\raisebox{-1ex}{${\mathrm{m}}^{3}$}\right..$What is the mass of this box?

This is a direct application of our formula. Simply plug in the numbers and solve.

id="2678741" role="math" $\begin{array}{rcl}m& =& \left(15.0\frac{\mathrm{kg}}{\overline{){\mathrm{m}}^{3}}}\right)\xb7\left(5.2\overline{){\mathrm{m}}^{3}}\right)\\ & & \\ m& =& 78\mathrm{kg}\end{array}$

Darren’s oven has a mass of$100\mathrm{kg}$and a density of$75\raisebox{1ex}{$\mathrm{kg}$}\!\left/ \!\raisebox{-1ex}{${\mathrm{m}}^{3}$}\right.$. What is the volume of Darren’s oven?

This question is slightly harder than the previous question, but not by much. All that we need to do is take our equation and rearrange the variables so that volume is the main focus since we need to solve for the value of volume. After this, we just need to plug our numbers in like we did in the last question:

$\begin{array}{rcl}m& =& \rho V\\ & & \\ V& =& \frac{m}{\rho}\\ & & \\ V& =& \frac{100\overline{)\mathrm{kg}}}{75\frac{\overline{)\mathrm{kg}}}{{\mathrm{m}}^{3}}}\\ & & \\ V& =& 1.3{\mathrm{m}}^{3}\end{array}$

Jane has a table with a mass of$40\mathrm{kg}$and a volume of$8{\mathrm{m}}^{3}.$ What is the density of Jane’s table?

This follows how the previous question was solved, we need to once again rearrange our original equation, and then substitute the values we’ve been given to calculate density:

$\begin{array}{rcl}m& =& \rho V\\ & & \\ \rho & =& \frac{m}{V}\\ & & \\ \rho & =& \frac{40\mathrm{kg}}{8{\mathrm{m}}^{3}}\\ & & \\ \rho & =& 5\frac{\mathrm{kg}}{{\mathrm{m}}^{3}}\end{array}$

Mass describes how much matter something is made up of.

Conservation of mass requires that mass can never be created or destroyed. It can only be transferred somewhere else or converted into something else.

Mass has many units, such as pounds, tons, and grams. However, the main SI unit of mass is kilograms.

The equation for solving mass is $\mathrm{mass}=\mathrm{density}/\mathrm{volume}$.

Mass in physics is described as how much matter there is in an object or person.

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