Allignment Flashcards
What is atmospheric pressure?
Air has weight and excerpts constant pressure. At sea level it is 14.7psi
PSIA = 14.7
1PSIA = kPA
6.9KPA
How do you convert gauge pressure to absolute pressure?
Add 14.7 pounds
Which of the following can be compressed or reduced in volume?
Gases
Or
Fluids
Gases
What are the three ways to increase the pressure of gas?
Reduce volume- so same number of molecules hit a smaller surface area
Pack more gas into confined space
Heat the gas- molecules move faster and hit the surface more often
What are the two scales that measure absolute temperature?
Kelvin scale
Rankine scale
0 Kelvin scale is equal to what on Celsius scale?
-273 degrees C
1 degree of change on Kelvin scale is equal to …… on Celsius scale?
1 degree
Rankine scale in in Celsius or Fahrenheit?
Fahrenheit
0 Rankin is equal to ……F?
-459.69 F
What is the difference between pascals law and bernoullis principle?
Pascals law deals with pressure in a non moving fluid.
Bernoulli’s principle deals with a constant flow of fluid
What does Boyles law state?
If the temperature is constant, the volume changes inversely to the pressure.
V1xP1=V2xP2
What does Charles law state?
If the pressure on a given volume of gas is held constant, the volume changes in direct proportion to the absolute temperature.
V1/T1=V2/T2
Gay-Lussac’s law states?
If the volume is constant the pressure exerted by the gas is directly proportional to the absolute temperature.
P1/T1=P2/T2
The combined gas law states:
All three laws exist in a compressor
P1xV1/T1=P2xV2/T2
What are the 3 important factors in pascals law?
Force
Area
Pressure
Units of measurement imperial?
Area: square inches
Mass: pounds
Force: pounds
Pressure: pounds per square inch
Units of measurement in metric?
Area: square meters
Mass: kilo grams
Force: newtons
Pressure: pascals or kilopascals (kPa)
What is force?
Anything that changes or tends to change the state of rest or motion.
Force=mass x acceleration
What is area?
The amount of surface within a confined boundary.
Area of a circle
A=3.14r2 of a circle
Area of a square
Length x width
What is pressure?
The degree or measure of a force that is applied to a specific area.
P=F/A