13.1 Fluid pressure

How is pressure calculated?

Pressure= force/area

Define pressure

The result of a force distributed over an area

What units are used when calculating pressure?

Force: newtons (N)

Area: square meters (m^2)

Pressure: pascals (Pa) or newtons per meter squared (N/m^2)

1 Pa= 1 N/m^2

If the area of a box that is touching the ground is 1.5 square meters, and its weight is 2700 newtons, what pressure does the box exert on the ground?

P=f/a

p=2700/1.5

p=1800

Define fluid

liquid or gas

How does water pressure change with depth?

Water pressure increases as depth increases

How is water distributed at a given level in a fluid?

The pressure in a fluid at any depth is constant, it is exterted equally on all sides/directions of the container

How are particles in a liquid arranged and how do they behave??

Tightly packed, yet still able to slide past eachother

How are particles in a gas arranged and how do they behave?

Far apart and travel in straight lines until they collide with another particle or object

What are the two factors that determine the pressure a fluid exerts in a **non moving fluid?**

Depth and the type of fluid

True or false: Pressure depends on the amount.

False, it depends on the depth of the container it is in.

What is the pressure that Earth’s atmosphere exerts at sea level?

101 KPa (kilo pascal) or 101,000 Pa

When altitude increases, what happens to air pressure?

Air pressure decreases

What is 1 atm = in KPa?

101 kPa\~

Convert KPa into atm:

1at/101 kpa

Convert atm to KPa:

101 KPa/ 1 atm

What is 1 bar worth?

100 KPa

Convert bar to kPa:

100 kpa/1 bar

Convert kpa to bar:

1 bar/100 kpa

How do you calculate force?

force=pressure \* area

What is the relationship between pressure and volume?

Pressure increase= less vloume

What is the relationship between atltitude and pressure?

Altiture increase= pressure decrease

Why aren’t humans crushed by atmospheric pressue?

The pressure we exude on the atmosphere is equal to the pressure it exudes on us which cancels out and equals 0.