Breath It In!!. The Earths Atmosphere What will happen in the future if we don’t change ? AOI: Environments. Contents. Composition of the earths atmosphere and it’s properties Structure of the atmosphere Atmospheric Pressure The importance of the atmosphere Observing the sky
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Whatwillhappen in thefutureifwedon’tchange?
=almost no atm.
= thick atm.
Gravity and Atmospheric Pressure
The air is made up of molecules.
Gravity pulls the air molecules toward the earth, giving them weight. The weight of the air molecules all around us is called the air pressure.
High altitudes = lower pressure
Low altitudes = higher pressure
Gas pressure depends on both density and temperature.
Adding air molecules increases the pressure in a balloon.
Heating the air also increases the pressure.
Air pressure is equal in all directions.
Pressure = force per unit area
Barometric pressure goes down.
As elevation goes up
This is an inverse relationship.
In 1643, Evangelista Torricelli invented the barometer
Torricelli’s barometer used a glass column suspended in a bowl of mercury. The pressure of the air molecules pushed the mercury up into the glass tube.
The weight of the mercury in the tube was equal to the weight of the air pressing down on the mercury in the dish.
As atmospheric pressure increases…
The mercury in the tube rises.
The Mercury Barometer
TheGreenhouseEffectis NOT thesame as Global Warming