Pressure Flashcards
What is Pressure?
Pressure is defined as force per unit area
Pressure Formula
P=F/A
What is Density?
Mass per unit volume
Measuring Mass
Measured using electronic balance
Measuring Volume
Measured using water displacement
Measuring Pressure in a fluid
hpg
What does not affect Pressure in a Liquid?
Volume and cross-sectional area do not affect pressure in a liquid
Mercury Barometer use
To measure atmospheric pressure
How to set-up a Mercury Barometer?
1m long glass tube is filled with mercury and inverted into a trough containing mercury
Space on top is vacuum
Units of Measurement for Mercury Barometer
Cm Hg OR Mm Hg
What affects the measurement of Atmospheric Pressure in a Mercury Barometer?
Only Vertical height
Independent of size of tube or how deep tube is placed into trough
Use of Manometer
Used to measure gas pressure
How to set-up Manometer
Consists of U-shaped glass tube with open end
Other end connected to gas supply whose pressure is to be measured by manometer
Tube partially filled with liquid of density p
How to measure pressure in Manometer?
P= hpg + Pₐₜₘ
How is pressure transmitted through a liquid?
Incompressible liquid is used to transmit pressure
As pressure is applied to enclosed liquid, pressure is transmitted equally to all parts of the liquid
