25 terms

# Study Guide 2

Refrigeration & Air Conditioning Technoloby
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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