Air Pressure
At higher altitudes, air pressure will ______.
decrease
Moisture in the air is called _____.
humidity
a puffy, middle level cloud
cumulus
Another name for air pressure is ________.
barometric pressure
Nice or cold weather is most likely during what type of pressure system?
HIGH pressure
What is the name of the weather instrument used to measure air pressure?
barometer
Dew & frost form in the same way. What is one major difference between them?
Frost forms below freezing temps; Dew forms above freezing temps.
a high level, wispy cloud
cirrus
What direction does air pressure push from?
ALL directions
Bad/stormy or warm weather is most likely during what type of pressure system?
LOW pressure
A low pressure system is also called a _______.
cyclone
What is the name of the weather instrument used to measure humidity?
sling psychrometer
Clouds are made of what 2 things?
Water vapor & condensation nuclei/dust particles
Explain how air pressure was involved in the upside down cup demo.
Air pressure pushes in all directions and was pushing up on the notecard. Air pressure also couldn't push down on the water since it was inside the cup.
low or stratus
Can warm air or cold air hold more moisture?
warm air
What two things are needed to calculate humidity using the relative humidity chart?
dry bulb temperature & wet bulb difference
stratus
Explain how air pressure was involved in the leaky bottle demo.
Water only leaks out of the bottle when air pressure can push on the surface of the water inside the bottle. It stops leaking when the lid it put on.
Condensation is when water vapor turns into a ______.
liquid
The density of air molecules changes based on what 3 things?
temperature, altitude, & humidity
The temperature when water vapor condenses back down to a liquid is called _______.
dewpoint
A large wall cloud for a thunderstorm; also known as a thunderhead
Explain how air pressure was involved in the can crushing demo.
The high pressure in the room couldn't get to the low pressure in the can, so it crushed the can while trying.
A low level rain cloud; all day rain
nimbostratus