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Refrigeration & Air Conditioning Technoloby

An example of a fossil is hydrogen

False

The law that states that "energy is neither created or destroyed, but can be converted from one form to another" is called the _____.

Law of conservation of energy

The type of energy stored in fossil fuels is referred to as _____ energy.

chemical

Most of the energy we use comes from something we already have on Earth. The only "new" energy we get comes from the _____.

Sun

A material that occupies space and has weight is called _____.

matter

_____ ft/lb of work is accomplished when an 800-lb. condensing unit is lifted to the top of a 40 ft. building.

32,000

One horsepower of work energy equals the amount of work done when lifting _____ pounds to the height of _____ foot in _____ minute.

33,000; one; one

The unit of measurement of electrical power is the _____.

watt

The three basic states of material are _____, _____, and _____.

solids; liquids; gases

One pound of ice at 20°F exerts its force downward. After absorbing 200 Btus, what direction(s) will the force be exerted? After absorbing 2000 Btus?

*Outward & downward

Define an atom.

*The smallest particle of an element.

Define a molecule.

The smallest particle that a substance can be broken into and still retain its chemical identity.

Define density.

The density of a substance describes its mass-to-volume relationship. The mass contained in a particular volume is the density of that substance.

Define specific gravity.

It is a unit less number because it is the density of a substance divided by the density of water.

Define specific volume.

Compares the volume that each pound of gas occupies.

Define power.

Rate of doing work.

Charles' Law

V1/T1=V2/T2

Dalton's Law

PTOTAL=PSUBSTANCE 1 + PSUBSTANCE 2

Boyle's law

P1 x V1 = P2 x V2

Specific volume

ft3/lb

hp

33,000 ft-lb/min

Specific gravity

no units

Density

lb/ft3

1 kW

3413 Btu

Work

Force x distance

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