Презентация на тему Air Pressure and Hot Air Balloons

air balloon?
What makes it fly through the air?


Air pressure

is a big
part of how hot air
balloons work.

is composed of many different elements such as oxygen,

nitrogen, and hydrogen.
These elements, in their gaseous state, fly around freely.
Every time they bump into each other, or another object, they push using a tiny bit of energy.

the atmosphere, the energy released upon interactions adds up

quickly.
This is called air pressure.
The air pressure at sea
level is about 1 kilogram per square centimeter.

the air pressure normally because it disperses evenly around

us.
Hold out your hand, palm up.
The air pressure exerted on the top of your hand is equal to the pressure of the air pushing up on the bottom of your hand.
The forces cancel out, and you don’t feel the effects of air pressure.

everything would be evenly balanced out.
However, we live on

a planet in which gravity plays a huge part.

and its effects extend to even our atmosphere.
But the

air pressure
creates an upward
force to counteract
gravity.
There is more air pressure at sea level because the air at that level has to support all the air above it.

sea level, the air pressure lessens.
The air pressure at

the top of Mount Everest is incredibly low because there is much less air above for it to support.
Climbers often breathe pressurized air when at high altitudes because their lungs cannot force such low pressure air into their bodies.

an upward buoyant force all around us.
This means that

there is less air pressure above an object, than below it.
This basic fact helps hot air balloons fly through the air.

the balloon because as air is heated, the molecules

in the air move faster.
In the balloons, this
makes the air inside
the balloon move
much faster than the
cool air of our atmosphere.

faster hit the walls of the balloons more often,

and at a greater force.
This means that it takes less hot air molecules to equal the same air pressure of cooler air molecules.
The hotter, less dense air inside the balloon help it rise against the cooler, denser atmospheric air.

is never constant, but a column of air may

have a relatively higher or lower pressure than nearby columns

Vertical and horizontal air pressure gradients affect wind and precipitation.

All weather is the effect of Earth correcting a temporary imbalance in the pressure or temperature gradient