Pressure Flashcards
What is the equation for density
Density = mass/volume
What letter is used for density
Rho (ρ)
If 1mm = 0.1cm, then what is 1mm^3 in cm^3?
1mm^3 = 1mm x 1mm x 1mm
= 0.1cm x 0.1cm x 0.1cm
= 1x10^-3 cm^3
How can you work out the density of an object?
- Weigh it for the mass
- Place it in a full eureka can
- Measure the volume of how much water is displaced
- That is the volume
- Density = mass / volume
What is pressure
The measure of force per unit area
Does pressure increase or decrease as you go up and why
Decreases - less matter (air molecules) pushing down on you)
What is the pressure at sea level
1 ATM
Is there greater or lesser pressure under the sea than at sea level and why
More pressure - more matter (water + air) pushing down
What is 1 atm in Pa (pascals)
1.01 x 10^5
What is the pressure influenced by
The amount of matter and the concentration of the matter acting
what is the equation for pressure
pressure = force/area
what is the equation for pressure at depth
pressure (at depth) = density (of the liquid it is in) x gravity x height (of the liquid above it)
What is Charles’ Law
velocity is proportional to temperature in kelvin
velocity/temperature(K) = b(constant)
V1/T1 = V2/T2
what is Boyle’s Law
P1V1 = P2V2
pressure is indirectly proportional to velocity
P = K/V where K is a constant
must be at a constant temperature and number of particles
What is the pressure law
Pressure is proportional to temperature in kelvin
P1/T1 = P2/T2
What is 0ºK
Absolute zero - -273ºC. It is when all particles stop vibrating. Negative kelvin does not exist
How to convert between temperature in K and temperature in C
C+273=K
K-273=C
What is the unit for density
Kilogram per cubic metre
Kg/m^3
What is the unit for pressure
Pascals (Pa)
Is pressure a force
No
Is cm^3 to m^3 simply dividing by 10
No - the conversion is long, so avoid if possible. If you have to, 1 million cubic centimetres is 1 cubic meter
How many square centimetres is the same as 1m squared
10,000
100x100 (each side is 100cm because it is a meter)
What is the relationship between volume and pressure
Pressure is inversely proportional to volume
P is proportional to 1/V
What is 0ºK in ºC
-273ºC
What is -273ºC in K
Non existent - K cannot be below 0
What is 1 atm in Pa
1.01 x 10^5
