Pressure and Flotation Flashcards
1
Q
density
A
- a substance’s mass per unit volume
- symbol = ρ
- unit = kg/m^3
2
Q
pressure
A
- force per unit area
- symbol = P
- unit = Pa or N/m²
3
Q
density equation
A
ρ = m/v
4
Q
pressure equation
A
P = F/A
5
Q
high pressure weather
A
summer - dry, fine
winter - frosty nights
6
Q
low pressure weather
A
wet, windy, cloudy
7
Q
atmospheric pressure
A
- 1 x 10^5 Pa
- 1 atm
8
Q
Boyle’s Law
A
- the volume of a fixed mass of gas is inversely proportional to it’s pressure so long as temperature is constant
9
Q
Pressure and Volume equation
A
- v = 1/P
- pressure halved - volume doubled
- pressure trebled - volume x 1/3
- PV = k (gas constant)
10
Q
Pressure in a liquid/gas
A
- P = ρgh
h = depth of fluid
11
Q
Hydrometer
A
- to gauge the density of liquids
- higher the density the higher the hydrometer floats
- has a calibrated scale
(used to measure skimmed milk (dense) vs full fat (less dense as full of fat)
12
Q
archimedes principle
A
whenever an object is totally or partially submerged in a fluid, it experiences an upthrust that is equal to the weight of the fluid it displaces
13
Q
upward force name
A
- upthrust or buoyancy
- deeper the object = larger
14
Q
Law of flotation
A
whenever an object is floating, the weight of the fluid displaced will equal the object’s weight
