therms

it is the focused volume in space from which the substance flows.

It is the measure of randomness of the molecules of a substance or the fraction of the total energy of a system that is not available for doing work.

It is a property that depends on the mass of the substance.

It is a quantity of matter or a region in space.

It is the rate at which velocity changes.

It is defined as the ratio of an object’s density to the density of some reference medium.

It is a substance to which heat can be stored and from which heat can be stored and from which heat can be extracted.

It is well defined as the energy stored in a moving body.

It is a working substance whose chemical composition remains the same even if there is a change of phase

It is a pressure lower than atmospheric pressure or a pressure reading below ‘zero’ gauge pressure