View Single Post
  #4  
Old 01-27-2006, 08:54 PM
Living_Chemistry's Avatar
Living_Chemistry Living_Chemistry is offline
Member
Regular Contributor
 
Join Date: Jan 2006
Location: Medicine Hat
Posts: 32
Rep Power: 14
Living_Chemistry is helpful, nice and has lots of friends here
Send a message via MSN to Living_Chemistry Send a message via Yahoo to Living_Chemistry
Wink How to measure pressure

Pressure equals force/area.
(p=f/a)

To answer your question, find the area of the hair (length x height).

Next, you have to find the force that was used. Typically a spring scale is used. Place the hair over the hook at the bottom. hold the top with your left hand. Pinch both sides of the hair, and gently pull down, watching the spring. Observe what tick the top of the spring said when the hair broke.

Now, use your formula and fill in what you know. (an example is listed below.)

Pressure = force/area
Pressure = 1N/10mm2
Pressure = 0.1 Pa.

Symbols:
N - The standard unit for force, indicating Newtons.
2 - The standard unit for area, indicating 'squared'
Pa - The standard unit in which Pressure is measured, indicating Pascals. If you have 1000 Pa, you can also say it is 1KPa (1 Kilo-Pascal)

Hope it helped!

Yours truly,
__________________

Joker Jones
Reply With Quote