# Hydrostatic Pressure

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## Video Clips

#### Pascal's Principle

RealVideo®
7:32 minutes (0:00 - 7:32)

Pressure and force in fluids; hydraulic lifts and equivalence of work on either side of lift.

Prior Knowledge: F=ma (6:52 of V6)
Instructor: Prof. Walter Lewin

#### Hydrostatic Pressure

RealVideo®
8:42 minutes (7:32 - 16:14)

Definition; incompressible fluids and dP/dy=-ρg. Pressure in paint cans filled with air and water.

Prior Knowledge: Pascal's Principle (beginning of V27)
Instructor: Prof. Walter Lewin

#### Pressure Dependence on Height

RealVideo®
7:39 minutes (16:14 - 23:53)

Using dP/dy=-ρ pressure from liquid weight and proportionality to height, density; atmospheric pressure.

Prior Knowledge: Hydrostatic Pressure (7:32 of V27)
Instructor: Prof. Walter Lewin

#### Barometers

RealVideo®
6:40 minutes (23:53 - 30:33)

Measuring pressure using Pascal's principle; mercury and water barometers.

Prior Knowledge: Pascal's Principle (beginning of V27)
Instructor: Prof. Walter Lewin

#### Overpressure and Submarines

RealVideo®
5:06 minutes (30:33 - 35:39)

Cornelius von Drebbel's 5-m submarine; overpressure; compression of evacuated can.

Prior Knowledge: Barometers (23:53 of V27)
Instructor: Prof. Walter Lewin

#### Manometers and Snorkeling

RealVideo®
6:02 minutes (35:39 - 41:41)

Explanation of manometers; setup for being able to breathe underwater through snorkel tube.

Prior Knowledge: Overpressure (30:33 of V27)
Instructor: Prof. Walter Lewin

#### Snorkeling and Drinking from Straws

RealVideo®
7:53 minutes (41:41 - 49:34)

Demonstration of maximum snorkeling depth; drinking from a 5-meter straw.

Prior Knowledge: Manometers and Snorkeling (35:39 of V27)
Instructor: Prof. Walter Lewin

## Lecture Notes

#### Archimedes' Principle

PDF
Page 1 to page 22

Pascal's law defined; Archimedes' principle defined (Fb = ρ*g*V); mass density and pressure defined; equation for pressure as a function of depth derived.

Instructors: Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

## Practice Problems

#### Properties of Fluids

PDF
Problem 1

Forces involved in air pressure and buoyancy.

Instructor: Dr. George Stephans

#### Oscillating Rod in Water

PDF#
Problem 4

Calculating period of oscillation for vertical rod in water given displacement and pressure.

Prior Knowledge: None
Instructor: Prof. Walter Lewin