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CP14 15
GCSE comboned
| Term | Definition |
|---|---|
| change of state | The changing of matter from one state to another, for example from solid to liquid. |
| chemical change | A change that results in the formation of new substances. |
| compress | To squash something together to make it shorter or smaller. |
| conserved | A quantity that is kept the same throughout, for example a substance does not change mass when it changes state. |
| density | The mass of a substance per unit volume. It has units such as kg/m3 or g/cm3. |
| kinetic theory | The model that explains the properties of different states of matter in terms of the movement of particles. |
| physical change | A change in which no new substances are formed, such as changes of state. |
| state of matter | One of three different forms that a substance can have: solid, liquid or gas. |
| sublimation | When a solid changes directly to a gas without becoming a liquid first |
| specific heat capacity | The energy needed to raise the temperature of 1 kg of a substance by 1 C. |
| specific latent heat | The energy taken in or released when 1 kg of a substance changes state. |
| temperature | A measure of how hot something is. |
| thermal energy | A term used to describe energy when it is stored in hot objects. The hotter something is, the more thermal energy it is storing. It is sometimes called heat energy. |
| absolute zero | The temperature at which the pressure of a gas drops to zero and the particles stop moving. It is −273 C or 0 K. |
| kelvin (K) | The unit in the Kelvin temperature scale. One kelvin (1 K) is the same temperature interval as 1 C. |
| Kelvin temperature scale | A temperature scale that measures temperatures relative to absolute zero. |
| kinetic energy | A term used to describe energy when it is stored in moving things. |
| pressure | The force on a certain area. It is measured in pascals or N/m2. |
| direct proportion | A linear relationship in which one variable doubles as the other does. |
| elastic | An elastic material changes shape when there is a force on it but returns to its original shape when the force is removed. |
| extension | The amount by which a spring or other stretchy material has stretched. It is worked out from the stretched length minus the original length. |
| inelastic | An inelastic material changes shape when there is a force on it but does not return to its original shape when the force is removed |
| linear relationship | A relationship between two variables shown by a straight line on a graph. For a linear relationship the line does not have to go through the origin. |
| non-linear relationship | A relationship between two variables that does not produce a straight line on a graph. |
| spring constant | A measure of how stiff a spring is. The spring constant is the force needed to stretch a spring by 1 m. |
| work done | A measure of the energy transferred when a force acts through a distance. |
Created by:
Davenant Foundation Physics
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