DC3RD Formulas

• Total Force = Pressure x Area
• TF =P x A
• 

• Work = Force x Distance
• W=FxD

1 Mechanical HP = 33,000 ft-lb of work/min

Heat added to a substance that changes its state without a change in temperature. hidden heat

The heat required to change the state of one pound of a substance from a solid to a liquid at a constant temperature

Heat that changes the temperature of a substance but not its state

• The heat necessary to change 1LB of a substance from a liquid to a gas at a constant  temperature.
• 1lb of water at 212F converted to 1lb of steam at 212F takes 970.3 Btu

The amount of heat required to raise the temp of 1lb of a substance 1deg F

• Quantity of heat = weight of a substance x latent heat
• Q=W x Lh