Modern ref. Chapter 5 Flashcards
Pressure is _____ per unit of area
force
What is a pascal?
a newton per square meter
Pressure =
force/area
Pascals law states
that pressure applied upon a confined fluid is transmitted equally and undiminished in all directions
Reducing atmospheric pressure lowers the ______ _____
boiling point
Raising atmospheric pressure raises the ______ _____
boiling point
1 atmosphere is equal to ____ psi at sea level
14.7
Pressure above atmospheric pressure is generally measured in?
pounds per square inch (psi)
Pressure below atmospheric pressure is measured in?
inches of mercury column
Where is saturated vapour most commonly found in a refrigeration system?
In the two heat exchangers; evaporator and condenser
What is saturated vapour?
a balance of an enclosed quantity of a vaporized fluid. Some liquid some vapour
A gas is any substance that has
no shape or volume and expands to fill its container
According to the definition and the formula for pressure, if the area increases, ____ _____
pressure decreases
According to pascals law, if a piston applies pressure to fluid in a cylinder, the pressure will remain unchanged but the:
temperature of the fluid will rise
Critical pressure is the minimum pressure at which a substance at its critical temperature can _____
condense
