Forces and matter : Pressure Flashcards
1
Q
What is pressure?
A
Force per unit area
2
Q
Formula for pressure
A
Pressure = Force / Area
3
Q
Unit for pressure
A
Pascals (Pa)
4
Q
What is 1 Pa the same as?
A
1 N/m^2
5
Q
Pressure in liquids formula
A
P = height * density * gravity P = heg
6
Q
What two things does pressure in liquids increase with?
A
Depth and density
7
Q
Why does water have a greater pressure than air?
A
Water is denser than air
8
Q
Atmospheric pressure
A
The pressure exerted by the column of air above the earth’s surface
9
Q
What do we use to measure atmospheric pressure?
A
A Mercury Barometer
10
Q
Value of atmospheric pressure
A
760 mm Hg
11
Q
Why is mercury used in barometers?
A
It has a high density
12
Q
Function of a manometer
A
Used to measure the pressure difference between two liquids or gases (fluids)
