# Fluids at rest

1 article

7 videos

1 skill

4B: Fluids can be fun even when they’re not moving. A still pond has more going on with it than meets the eye - why exactly do you even float when you decide to jump in on a scalding summer day? It’s because you displace a volume of water that provides a buoyant force upward, counteracting the downward pull of gravity. You will find out why the great Archimedes ran through the streets of Syracuse shouting "eureka" millennia ago in Ancient Greece as we also delve into the concepts of pressure, specific gravity, buoyancy, and Bernoulli's principle.

### Pressure and Pascal's principle (part 1)

VIDEO
9:46 minutes

Sal explains the difference between liquids and gasses (both fluids). He then starts a calculation of the work done on a liquid in a U-shaped container.

### Pressure and Pascal's principle (part 2)

VIDEO
10:12 minutes

Sal finishes the calculation or work to determine the mechanical advantage in a U-shaped tube. He also explains pressure and Pascal's Principal.

### Pressure at a depth in a fluid

VIDEO
9:54 minutes

Sal derives the formula to determine the pressure at a specific depth in a fluid.

### Finding height of fluid in a barometer

VIDEO
10:09 minutes

Using our understanding of fluid pressure to figure out the height of a column of mercury.

### Archimedes principle and buoyant force

VIDEO
8:41 minutes

Introduction to Archimedes' principle and buoyant force.

### Buoyant force example problems edited

VIDEO
9:22 minutes

Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT related content. These videos do not provide medical advice and are for ...

### Specific gravity

VIDEO
3:10 minutes

In this video David explains what specific gravity means. He also shows how to calculate the value for specific gravity and use it to determine the percent of an object that will be submerged while floating.