Fluid Pressure Flashcards
1
Q
What is the pressure exerted on us at Sea Level?
A
100,000 Pa
2
Q
Why arent we crushed by the atmospheric pressure?
A
Atmospheric pressure is balanced by the pressure inside our bodies.
3
Q
Why do we need atmospheric pressure to breathe?
A
- When your diaphram moves down it creates more space in your chest
- Lowers your internal pressure
- Higher atmopsheric pressure outside your lungs causes air to be pushed into your lungs
4
Q
Why is it more difficult to breathe at higher altitudes?
A
- Higher altitudes less weight of air pushing down on you.
- Reduces atmospheric pressure
5
Q
Why is it that underwater pressure is greater than atmospheric?
A
- Due to added weight of water pushing down on you
6
Q
How to calculate the pressure due to fluid density at a depth/height?
A
Pressure (Pa) = Height (m) X Density (kg m-3) X Gravitational Field Strength (N kg-1)
p = h P (weird density P) g
7
Q
What does this equation -
Pressure (Pa) = Height (m) X Density (kg m-3) X Gravitational Field Strength (N kg-1)
Only apply to????
A
Incompressable Fluids
8
Q
2 key points about fluid pressure?
A
- Pressure increases with depth and all points at the same depth are at the same pressure
- Pressure acts equally in all directions, so the froce that is produced is always at right angles to the surface in contact.
