# Gas - Total Fall and Grade Btu Calculations Gas Laws[][][][][][] Flashcards

The amount of energy it takes to raise one pound of a substance 1°F is the definition of?

Specific heat.

The heat required to change the state of a substance is the definition of?

Latent heat.

The heat required in order to change the temperature of a substance is the definition of?

Sensible heat (Heat that can be sensed by a thermometer).

The amount of energy it takes to raise one pount of water 1°F is the definition of?

Btu.

What are the three variables used when dealing with the gas laws?

Pressure.

Temperature.

Volume[][][][][]

Of the three variables used when dealing with the gas laws which ones need to be put into absolutes before you are able to work with them?

Pressure.

Temperature.

How do you change pressure and temperature variables into absolute?

°Kelvin = °Celcius + 273.

°Rankine = °Fahrenheit + 460.

Absolute pressure = gauge pressure + atmospheric pressure (14.7 psia).

What are the names of the three gas laws and what are their formulas?

Boyle’s Law = P1 x V1 = P2 x V2

Charles Law = V1 ÷ T1 = V2 ÷ T2

Gay-Lussac’s Law = P1 ÷ T1 = P2 ÷ T2

What is the formula for the combined gas law?

P1 x T2 x V1 = P2 x T1 x V2