Substances exist in one of three main phases (solid, liquid or gas). When substances change from one phase to another they may freeze, melt, condense, vaporize, or sublime.
The reduction in volume of a substance using a mechanical force.
When a substance changes from a gas or vapour to a liquid.
To change from a gas or vapour to a liquid.
When a substance changes from a gas or vapour to a liquid.
A method of heat transfer. Usually through a solid material.
A method of heat transfer. High temperature particles rise above lower temperature particles in a liquid or gas. The higher temperature particles carry the heat energy with them.
The temperature above which a gas cannot be condensed by raising its pressure.
A physical process by which matter becomes dispersed.
A physical process by which matter becomes dispersed.
The capacity of a physical system to perform work (measured in units called Joules).
When a liquid changes to a gaseous state to form a vapour.
Increasing the volume of a substance, usually a gas.
A component that controls the amount of refrigerant released into the evaporator, sometimes called a metering device.
A component that controls the amount of refrigerant released into the evaporator, sometimes called a metering device
A liquid, gas or vapour.
Solidification of the water within food by reduction of temperature.
Gravity is a natural force by which all things with mass—like apples—are attracted (or gravitate toward) one another – like the earth.
Heat is a form of energy which is transferred through radiation, convection or conduction.
Material which has a low heat conductivity and is used to reduce the transfer of heat.
The heat required to convert a solid into a liquid or vapour, or a liquid into a vapour, without change of temperature.
Substances exist in one of three main phases (solid, liquid or gas). When substances change from one phase to another they may freeze, melt, condense, vaporize, or sublime.
The rate of production or creation of energy, usually measured in units of joules/sec, Watts (Btu/h).
The physical force exerted on a substance by a fluid in contact with it, usually measured in units Pascal (bar, psi). A force exerted over a specified area.
The physical force exerted on a substance by a fluid in contact with it, usually measured units Pascal (bar abs, psia).
The difference in pressure between that of the substance and standard atmospheric pressure, units bar gauge (psig).
Transfer of energy by electromgnetic waves which may tavel through space or a material.
A substance used in a mechanical circuit to create cooling or heating of a product or space.
English scientist (1642-1727).
Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.
The degree or intensity of heat present in a substance, measured according to a recognised scale, units °C (°F).
The degree or intensity of heat present in a substance, measured from absolute zero, units K.
Instrument for measuring temperature.
This is a gauge used to measure very low pressures, sometimes called a vacuum gauge.
When a liquid changes to a gaseous state to form a vapour.
A substance in the gas phase.
Vapour compression is the wording used to describe the most commonly used mechanical refrigeration cycle for fridges and air conditioning. The refrigerant vapour is compressed by a motor (or compressor) allowing it to condense at high pressure, and reject heat to a higher temperature.
The amount of space that a substance or object occupies, units cubic metres (cubic feet).