What is water called when it is a gas?
What is evaporation?
Changing of a liquid to a gas
What is transpiration?
Process by which plants give off water vapor into the air
What is capacity?
Amount of material something can hold
What is humidity?
Amount of water vapor in the air
What is saturated?
Filled to capacity
What is specific humidity?
Actual amount of water in the air
At which temperature will air hold more water vapor, 10C or 25C?
What is a psychrometer?
Instrument used to find relative humidity
What is relative humidity?
Amount of water vapor in the air compared to the amount of water vapor the air can hold at capacity
How do you find relative humidity?
1) Find the difference in the temperature of the dry and wet thermometer 2) Find the temperature of the dry thermometer 3) Humidity Chart
What is condensation?
Changing of a gas to a liquid
What is dew point?
Temperature to which air must be cooled to reach saturation
What is frost?
Ice formed from condensation below the freezing point of water
What process forms clouds?
What are cirrus clouds?
Light, feathery clouds
What are cumulus clouds?
big, puffy clouds
What are stratus clouds?
Clouds that form layers across the sky
What is fog?
A cloud that forms near the ground
What are the two main forms of precipitation?
Rain and snow
What is precipitation?
Water that falls to the earth from the atmosphere
What is a rain gauge?
Instrument used to measure precipitation
What is an air mass?
A large area of air that has the same temperatureand amount of moisture
What is polar air mass?
Air mass that forms over cold regions
What is a tropical air mass?
Air mass that forms over warm regions
What are air masses that form over water called?
What is a cold front?
Forward edge of a cold air mass, formed when a cold air mass pushes under a warm air mass
What is a front?
Surface between different air masses
What is a warm front?
Forward edge of a warm air mass, formed when a warm air mass pushes over a cold air mass
What is a hurricane?
Tropical storm with very strong winds
What are thunderstorms?
A storm with thunder, lightning, heavy rain, and strong winds
What is a tornado?
A small, very violent funnel-shaped storm
What is lightning?
A giant storm cloud that gives off electricity
What is the eye of a hurricane like?
Calm, no wind or rain
What is a millibar?
A unit of measurement for air pressure
What is a station model?
A record of weather information at a weather station
What are meteorologists?
Scientists that study weather
What are isobars?
Lines on a weather map that connects points of equal air pressure
What is a weather map?
A map that shows weather conditions for many places at one time