# Liquids

CpSurf- Hewitt's Companion Web Page for this chapter

19.1 LIQUID PRESSURE

#### Liquids virtual labs

Buoyancy

Submarines: How They Work - Archimedes' Principle
http://www.onr.navy.mil/focus/blowballast/sub/work2.htm

Bernouilli's Principle, control surfaces and paper airplanes, navigation, meteorology, propulsion, Charles' and Boyles' Laws, and more.

The Java Virtual Wind Tunnel which uses computational fluid dynamics (CFD) methods to simulate the flow of air over a two dimensional object. Written by Craig Hunter, Aero- and Gas Dynamics Division, NASA Langley Research Center.

The heart - http://www.fi.edu/biosci/heart.html. A site devoted to the most important pump and fluid in your life. The structure and development of the heart as well as cardiac health are presented at length. A killer reference site, the medweb cardiology site is referenced here

Water Distribution How does a toilet work? Why are water towers larger on top than on the bottom? Find out the answers to these and other questions in this site from Louis A. Bloomfield's online book How Things Work.

Fluid Pressure and Depth Learn how water pressure varies with depth in this lesson from NASA's Aeronautic Activities page.

19.2 BUOYANCY

Microsubs Go to Sea In this Scientific American  a new breed of submarines for exploring the ocean depths. small, maneuverable, self-contained submersibles may some day take humans to the bottom of the sea.

Descartes' Diver  create a Cartesian diver from a soda bottle and an eyedropper or a ballpoint pen. Watch the diver go up and down as you squeeze the bottle.

19.3 ARCHIMEDES' PRINCIPLE

Water Faucets How does the automatic cutoff valve on a gasoline pump work? Why does a hose squirt further when you cover part of the hole with your thumb?

Find out the answer to these and other questions in this page from Louis A. Bloomfield's online book How Things Work.

Buoyancy: Archimedes' Principle Learn about Archimedes' principle in this lesson from NASA's Aeronautic Activities page.

19.4 DOES IT SINK OR DOES IT FLOAT?

Buoyancy Put a can of soda in your bath and it will sink. Put a can of diet soda in the bathtub and it will float. Why? This activity is provided by the National Science Teachers Association.

19.5 FLOTATION