UCEL lion

home icon

Reusable Learning Object

Science Basics: Pressure sound on image

Introduction
 
Pressure
Ulcers
 
Measurement
 
Blood
Pressure
 
Units
 
Boyle's
Law
 
Activity
 
Assessment
 
Resources
 
Feedback

Measurement

One way to measure pressure is to make a manometer by inverting a glas tube containing mercury into a container also containing mercury.

The heavy mercury column in the tube sinks, but the tube does not empty because of the effect of atmospheric pressure on the mercury in the container. The higher the atmospheric pressure the greater the height of the mercury column.

Consequently atmospheric pressure can be measured in terms of the height of the mercury column and at sea level it is about 760 millimetres of mercury (mmHg).

previous button Next button
------------------------------------
Page created: 2 March, 2004
Last updated: 13 July, 2007 12:19 PM
By: Gareth Peevers, Mark Foss