AIR PRIESSURE

SCIENCE 6- 6TH GRADE

What is air pressure?

refers to how much air is close to the ground. Air pressing down against everything it touches.

What are the properties of warm air and cold air?

*Warm is less dense, rises, and leaves less air. Holds more humidity

Warm air- low pressure and it brings clouds or rain.

**Cold air is more dense, sinks, and leaves more air. Hold less humidity.

Cold air- high pressure and it brings clear and sunny weather.

How does air move?

moves from high pressure area to low pressure

High air pressure

moves clockwise

Low air pressure

moves counter clockwise

Sea breeze

movement of air from sea to land during the day when cooler air from above the water moves over the land, forcing the heated, less dense air above the land to rise

land breeze

movement of air from land to sea at night created when cooler, denser air from the land forces up warmer air over the sea

Which tool is used to measure air pressure

Atmospheric presses are commonly measured with a BAROMETER

What is wind

The wind is moving because of air pressure. The Earth's rotation influences the wind direction

*Wind is blowing from the south, it is usually warm

*wind blowing from the north is usually cold

Which tool is used to measurethe directions of wind

Wind vanes

Which tool is used to measure the wind speed

anemomethers

what are air fronts

when two air masses meet. a front is where one air mass meets another air mass.

how many air fronts are there in the atmosphere

four air fronts which are:

WARM AIR FRONT

COLD AIR FRONT

STATIONARY AIR FRONT

OCCLUDED FRONT

warm air front

warm air mass meets cold air mass and warm air moves.

gradual increase in temperature, humidity, ofter rain and drizzle

cold air front

when cold air mass meets warm sir mass and cold air moves

stationary air front

warm and cold air mass meets but neither of them moves and gets stuck,

occluded from

one warm air mass gets stuck in between two cold air masses. temperature stays a mix of warm and cool air