Science Flashcards
What does STP stand for
Standard temperature and pressure
Describes the heat added or removed from a substance that would cause a change in temperature of the substance
Sensible heat
Describes the heat added or removed to a substance that would cause a change in state
Latent heat
Describes a ratio of the heat capacity of a substance compared to that of water
Specific heat
Describes the degree of hotness of a substance with no indication of the thermal energy content of the substance
Temperature
States the volume of any dry gas varies inversely with the absolute pressure exerted upon it while pressure remains constant
Boyles law
States that the volume of any dry gas varies directly with the absolute temperature of the gas while the absolute pressure of the gas remains the same
Charles law
Density of 1cuft air at stp?
.0807 lbs/cuff
Standard temperature and pressure values
32deg F 14.7 psi
BTU value of latent heat of fusion at 14.7psi
144 btu
BTU value of latent heat of vaporization at 14.7 psi
970.4 btu
BTU value to change sensible heat of 1lb of water 1deg F
1 btu
Three ways liquid chan be changed to a vapor
Boiling/steam
Flashing
Evaporation
As pressure of a liquid increases boiling point?
Increases
Definition of comfort for pipefitting
When the body is neither to hot or to cold
Three ways body can loose heat
Evaporation (sweat)
Convection
Radiation
TF: liquids and gasses make good conductors of heat
False
Explain the purpose of expansion joints, loops, or bends
To prevent damage to piping by compensating for the expansion and contraction of piping
Reason for putting an expansion tank in a hot water system
Allow for expansion of liquid
What does it mean if an expansion tank becomes waterlogged
No air in the tank, diaphragm or something is bad
What happens when an expansion tank becomes waterlogged
Relief valve will go off, call for more water, water will drain out vent, cycle will start again
Specifically, where are metals with two different coefficient of expansion put together
Bimetal thermostats
Three states of matter
Solid liquid gas
Hydrometer is used for
Finding specific gravity of liquids
Definition of substance
Any state of matter of a particular composition or makeup
Definition of matter
Anything that has weight (mass) and occupies space or has a volume
Definition of mass
The measure or quantity of matter which a body contains
Definition of weight
Measure of the attraction of the earth for a given body
Definition of energy
The ability to do work
Definition of density
Weight of unit of volume of a substance
Gallons per cuft
7.83 gal/cuft
Weight of 1cuft of water
62.4 lbs
What is absolute zero in Fahrenheit
-460 Fahrenheit
