If you've blown up a balloon, pumped up a bike tire or used a vacuum cleaner you already have a lot of experience with pressure.

Pressure is the amount of force exerted by a fluid on a surface per unit of area. If the air pressure in a bike tire is 50 psi (pounds / square inch) then each square inch of the rubber inside the tire is experiencing 50 pounds of force (about 222 Newtons). And if we increase the pressure in any part of an enclosed fluid, the pressure increases by the same amount everywhere (known as Pascal's principle).

We're going to talk about atmospheric pressure (the air pressure around us) and the difference between absolute pressure and gauge pressure.

Finally, we'll learn how to describe the pressure in a fluid at different points, and how fluid pressure increases with depth due to the weight of the fluid above it.

Multiple-Choice Questions

Answers

• Crash Course - Fluids at Rest
• What is Pressure?
• Michel van Biezen - Pressure in a Fluid
• Michel van Biezen - Gauge Pressure vs Total Pressure
• Michel van Biezen - Pascal's Principle: Hydraulic Pump
• Michel van Biezen - The Barometer
• Michel van Biezen - Pressure Gauge

• Organic Chemistry Tutor - Absolute Pressure vs Gauge Pressure
• Organic Chemistry Tutor - U Tube Manometers With Oil and Water
• Organic Chemistry Tutor - Pascal's Principle, Hydraulic Lifts
• Organic Chemistry Tutor - Water Pressure, Gauge Pressure, Blood Pressure

• Walter Lewin - Fluid Mechanics, Hydrostatics, Pascal's Principle, Atmosph. Pressure
• Walter Lewin - Hydrostatics, Archimedes' Principle, Bernoulli's Equation
• Hyperphysics - Fluids

• Pressure unit converter

Other Resources

If you've blown up a balloon, pumped up a bike tire or used a vacuum cleaner you already have a lot of experience with pressure.

Pressure is the amount of force exerted by a fluid on a surface per unit of area. If the air pressure in a bike tire is 50 psi (pounds / square inch) then each square inch of the rubber inside the tire is experiencing 50 pounds of force (about 222 Newtons). And if we increase the pressure in any part of an enclosed fluid, the pressure increases by the same amount everywhere (known as Pascal's principle).

We're going to talk about atmospheric pressure (the air pressure around us) and the difference between absolute pressure and gauge pressure.

Finally, we'll learn how to describe the pressure in a fluid at different points, and how fluid pressure increases with depth due to the weight of the fluid above it.