Heat Definitions

Flashcards by mckenziedev, updated more than 1 year ago
Created by mckenziedev over 7 years ago


1 Physics (Heat) Flashcards on Heat Definitions, created by mckenziedev on 09/07/2013.

Resource summary

Question Answer
Heat A form of energy which can be transformed. It is the total kinetic and potential energies of the particles that make up the object
Temperature A measure of the average kinetic energy of the particles that make up a substance
Joule The unit for energy
Celsius A temperature scale based around the melting and boiling points of water
Kelvin A temperature scale that starts from absolute zero
Hotter A term used to describe an object with greater temperature/average kinetic energy of its particles
Colder A term used to describe an object with lower temperature/average kinetic energy of its particles
Change Of State Adding or removing heat changes the kinetic energy of the particles and can cause the object to move form one state to another
Thermal Conductor An object that allows heat to flow through it
Thermal Insulator An object that restricts the flow of heat through it
Conduction The heat transfer process which occurs because objects are touching
Convection The heat transfer process that occurs because objects are fluid/can move
Radiation The heat transfer that occurs without the need for particles/can travel through a vacuum
Vacuum A region with no particles
Density The mass per unit volume of a substance
Convection Current The flow of particles due to the heating and cooling of the object
Solid Particles packed tightly together in a fixed position. They are gently vibrating, but are held together by strong forces
Liquid Particles are moving and can slide past each other. They are held together by weaker forces and not in a fixed pattern
Gas Particles are spaced far apart and move about very quickly. The forces trying to hold them together cannot overcome their rapid movement
Melting Particles gain kinetic energy and spread out/vibrate more to go from a solid to a liquid
Evaporating Particles in a liquid gain more kinetic energy and therefore take up more room and turn into a gas
Sublimation A solid turns to a gas state without change to a liquid
Freezing A liquid turns to a solid because of a sudden loss of kinetic energy to the particles
Condensation A gas turns to a liquid state
Deposition A gas turns to a solid state without changing to a liquid
Specific Heat Capacity The amount of energy needed to change the temperature of 1kg of the substance by 1 degree c
Latent Heat of Vaporisation Used for changes between liquid and gas (evaporating/condensing)
Latent Heat of Fusion The amount of energy used for changes between solid and liquid (melting/freezing)
Latent Heat How much heat energy is absorbed or released when a substance changes state without changing temperature
Power A measure of the rate of heat energy absorbed or released when a substance changes temperature
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