Air Pressure
Which instrument do you use to find air pressure?
barometer
What instrument is used to measure relative humidity and dew point?
sling psychrometer
Name two ways the sun affects weather on Earth?
The sun provides almost all of Earth's energy and heats the Earth.
What causes tides?
the moon's gravity
What are the three main cloud types?
Stratus, Cumulus, and Cirrus
What type of pressure system brings warm air and storms?
low pressure
What is the relationship between air pressure and relative humidity?
As air pressure increases, relative humidity decreases
What is air made up of molecules. Are they always moving and how do they move?
Yes, they are always moving. They move randomly.
What is a tidal range?
the difference between levels of ocean water at high tide and low tide
A dark cloud is called Nimbus. What does it contain?
high amounts of rain or snow
What type of weather is associated with a low pressure system?
warm and wet storms
What is the relationship between air temperature and the ability to hold moisture?
As air temperature increases, the ability to hold moisture increases
Name two tools for measuring wind direction.
weather vane and anemometer
What happens when the sun, earth, and the moon are aligned?
Spring Tide
How are clouds formed?
Clouds are formed as warm air is forced upward, expands, and then cools.
When the weather outside is calm and the sky is clear, we call this a _______ ________ ________ .
high pressure system
If relative humidity is 100%, what do you know about the air temperature and dew point temperature?
The air temperature and dew point temperature are equal.
What is the amount of water vapor in the air called?
humidity
When the sun, Earth and moon form an 90 degree angle, it causes the smallest daily tidal range. What is this tide called?
Neap Tide
What is water falling from the clouds called? (hint: you cannot say rain)
precipitation
What two units are used to measure air pressure?
inches of mercury (in Hg) and millibars
As the air temperature and dew point temperature get further apart, what happens to the relative humidity?
The relative humidity decreases as air temperature and dew point temperature get further apart.
What is the relationship between cooler temperatures and the movement of molecules in the air.
As temperature decreases, the movement of molecules in the air decreases.
about 50 minutes
air temperature and water vapor