# Shared Flashcard Set

## Details

Physics/Thermodynamics
Homework #4
20
Engineering
Professional
07/09/2009

Term
 What is Potential Energy? Kinetic Energy?
Definition
 Potential energy is energy possessed by reason of position or deformation. Kinetic energy is energy possessed by reason of motion.
Term
 What are the First and Second Laws of Thermodynamics?
Definition
 1st: Energy cannot be created or destroyed but may be converted from one form to another. 2nd: No machine, actual or ideal, can both continuously and completely transform heat into mechanical energy. Nothing is 100% efficient.
Term
 Name three ways that heat is transferred
Definition
Term
 What is a British Thermal Unit?
Definition
 A BTU is the amount of heat required to raise the temperature of One Pound of water one degree Fahrenheit.
Term
 Convert 22° Celsius to °Fahrenheit.
Definition
 Multiply 22° by 1.8 (which equals 39.6), then add 32, which makes a total of 71.6°F.
Term
 Convert 105°F to °Celsius
Definition
 Subtract 105° by 32 (which equals 73), and then divide by 1.8 which brings you to 40.56°C
Term
 How many BTU's are required to raise one pound of water from 50°F to 210°F?
Definition
 160 BTU's
Term
 How many BTU's are requires to raise the temperature of 500 GALLONS of water from 70°F to 160°F?
Definition
 Convert GALLONS to pounds by multiplying 500 by 8.33 (which equals 4165), then multiply the BTU's from 70°F to 160°F (which is 90 BTU's) by 4165 and the total BTU's is 374,850 BTU's.
Term
 You have a 2,000 GALLON tank filled with water, how much does the water weigh?
Definition
 16660 Pounds.
Term
 The pressure gauge reads 130 PSI, what is the Absolute Pressure?
Definition
 144.7PSIA
Term
 What is the Latent Heat of Fusion?
Definition
 Heat added to solid to cause a change of state to a liquid. (One pound of Ice at 32°F becomes Water with the addition of 144 BTU's of heat)
Term
 What is the Latent Heat of Evaporation?
Definition
 Heat added to a liquid to cause a change of state to a gas/vapor. (One pound of water at 212°F becomes one pound of steam at 212°F when 970.3 BTU's of heat are added)
Term
 How many BTU's in a pound of steam at 212°F?
Definition
 1150.3 BTU's
Term
 What is Sensible Heat and Latent Heat?
Definition
 Sensible Heat is heat that is added to a substance that causes a change in temperature that can be measured with a thermometer. Latent heat is heat that is added to a substance that causes a change of state without a change in temperature.
Term
 What is the critical pressure of steam?
Definition
 3206.2 PSIA
Term
 What is the critical temperature of steam?
Definition
 705°F
Term
 What happens to the boiling point of water as the pressure increases?
Definition
 It also increases
Term
 What happens to the Enthalpy of Evaporation as the pressure increases?
Definition
 It decreases
Term
 What are the three states of matter?
Definition
 Solid, Liquid, and Gas
Term
 What is the definition of specific heat?
Definition
 The amount of heat required to raise the temperature of one pound of any substance one °F
Supporting users have an ad free experience!