Monday, 16 June 2014 14:50

## F1-13: CONSTANT WATER PRESSURE

• ID Code: F1-13
• Purpose: Demonstrate a mechanism which produces a constant water pressure.
• Description:

Air enters the aspirator bottle, initially almost filled with water, through a tube inserted through a sealed stopper into the water bath, while the water leaves through a nipple near the bottom of the bottle. This arrangement provides a constant water pressure head, which is equal to the height of the water column between the nipple and the bottom end of the tube. Thus the water jet will have the same range as the water level in the bottle falls from its initial level to the level of the bottom of the tube.

The idea of this gizmo to provide water at a constant pressure, was first proposed by Edme Mariotte, a 17th century French scientist. A device called the Mariotte siphon, making use of this concept, is used in agriculture to provide irrigation at a constant flow rate and as a research tool in determining the properties of soil. His work is also cited in the Catholic Encyclopedia.

• Availability: Available
• #### F1-01 FLUID PRESSURE VS. DEPTH

Demonstrates that fluid pressure increases linearly with depth and is isotropic. Read More
• #### F1-02: FLUID PRESSURE VS DEPTH - ANEROID GAUGE

Show water pressure versus depth with an aneroid gauge. Read More
• #### F1-03: PASCAL'S VASES

Show water pressure versus depth with an aneroid gauge. Read More
• #### F1-04: EQUILIBRIUM TUBES

Demonstrate that pressure is transmitted equally throughout a fluid. Read More
• #### F1-05: DOES WATER SEEK ITS OWN LEVEL?

A trick to challenge the students. Read More
• #### F1-06 WATER SEEKS ITS OWN LEVEL

Demonstrate that pressure is dependent only on depth, and not on the shape of the container. Read More
• #### F1-11: HYDRAULIC PRESS

Demonstrate dramatically Pascal's Law and the large forces attainable using hydraulic systems. Read More
• #### F1-12: PASCAL'S LAW - COILED TUBE PARADOX

Illustrate Pascal's law in a dramatic way. Read More
• #### F1-13: CONSTANT WATER PRESSURE

Demonstrate a mechanism which produces a constant water pressure. Read More
• #### F1-14: PISTON DIAMETER VS TRAVEL - WORKING MODEL

Show that with an incompressible fluid the bigger piston moves more slowly than the smaller piston. Read More
• #### F1-15: PRESSURE GLOBE

Demonstrate principles of air pressure. Read More
• #### F1-21: LIPLESS STRAW

Demonstrate the role of atmospheric pressure in the operation of a drinking straw. Read More
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