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 temperature scale - A temperature scale that measures temperatures relative to absolute zero., Kelvin (K) - The unit in the Kelvin temperature scale. One kelvin (1 K) is the same temperature interval as 1 C., kinetic energy - A term used to describe energy when it is stored in moving things., pascal (Pa) - A unit of pressure, 1 Pa = 1 N/m2, pressure - The force on a certain area. It is measured in pascals or N/m2., gas pressure - The force on a surface caused by the collisions of gas particles with the surface. Gas pressure acts at right angles to a surface., work done - A measure of the energy transferred when a force acts through a distance., atmospheric pressure - The pressure exerted by the weight of the air around us., density - A measure of a substance’s mass per unit volume. A common unit for density is kg/m3., fluid - A gas or liquid., displace - To push out of the way., upthrust - A force that pushes things up in liquids and gases.,

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