the air around you section 15:1. composition of the atmosphere complete the following statement: the...
TRANSCRIPT
Composition of the Atmosphere
Complete the following statement:
The atmosphere consists 78% of what gas?
Composition of the Atmosphere
• Other gases 1%
Argon
Carbon Dioxide
Water Vapor
Helium
Neon
Methane
Hydrogen
Ozone
Properties of Air
• Does air have mass?
• How can we show that air does have mass?
Watch YouTube video on bhoelzle.wikispaces.com
VideoEgg in bottle
Properties of Air
Density =
Mass
Volume
Because air has mass it also has other properties including:
Pressure – force pushing on an area or surface
Measuring Air Pressure
• Mercury Barometer – glass tube and a
dish of mercury
Pressure is measured by measuring the height of the mercury
Measuring Air Pressure
• Aneroid Barometer – airtight chamber
connected to a dial by a series of
springs and levers
Measuring Air Pressure
• Weather reports use several units for pressure
Millimeters of mercury
Inches of mercury
Millibars 1in = 33.87mb
Altitude and the Properties of Air
• Altitude- Distance above sea levelAs altitude increases
Air pressure decreases
Lower air pressure
Higherair pressure
There is less weight of air molecules on you as you climb the mountain