Air – a mixture of gases. 78% Nitrogen, 20% Oxygen, 2% All other gases combined
Air Mass – a large body of air with the same temperature and moisture throughout.
Air Pressure – the weight of all the air above pushing down.
Anemometer – the instrument that measures wind speed.
Atmosphere – the thin layer of gases that surround Earth.
Barometer – the instrument that measures air pressure.
Climate – the condition of the atmosphere over a long period of time.
Cloud – a collection of billions of droplets of liquid water in the sky.
Cold Front – cold air pushing warm air ahead of it. Usually brings brief bad weather.
Condensation – water vapor changing into liquid water as the atoms lose energy.
Convection – the cyclic motion of liquids and gases due to density differences caused by unequal heating.
Continental Air Mass – dry air
Dew Point Temperature – the temperature that water condenses at and forms clouds.
Evaporation - liquid water changing into water vapor as the atoms gain energy.
Freezing – liquid water changing into solid water as atoms lose energy.
Front – the boundary between two air masses.
Greenhouse Effect – a average increase in air temperature as energy is trapped by greenhouse gases in the atmosphere or the glass in an actual greenhouse.
Greenhouse Gas – carbon dioxide(CO2), water vapor(H2O) or methane(CH3) trap heat energy in the atmosphere.
Hazardous Weather – severe storms that are dangerous to people and property, includes thunderstorms, winter storms, tornadoes & hurricanes.
High Pressure System – cool, dry, dense air that is sinking and produces clear skies and fair weather.
Humidity – the amount of water vapor in the air.
Hydrosphere – water layer of Earth
Jet Stream – air flow in upper atmosphere the influences weather patterns.
Lithosphere – solid layers of Earth.
Low Pressure System – warm, moist, light air that rises forming clouds and foul weather.
Maritime Air Mass – moist air
Melting – solid water changing to liquid water as the atoms gain energy
Meteorology – the study of Earth’s atmosphere, weather and climate
Ozone – a kind of oxygen (O3) in the stratosphere that absorbs and protects you from ultra-violet (UV) radiation
Polar Air Mass – cold air
Precipitation – liquid or solid water falling from clouds.
Prevailing Wind – the usual wind pattern for a latitude zone that controls the direction weather moves.
Stratosphere – atmosphere layer above troposphere that contains ozone and where the jet stream is.
Temperature –the average kinetic energy (motion) of particles (a measure of heat energy).
Transpiration – water vapor moving into the atmosphere from plants
Tropical Air Mass – warm air
Troposphere – the lowest atmosphere layer contains water and is where our weather is found.
Warm Front - warm air pushing or riding up over cooler air ahead of it. Usually brings long periods of cloudy or rainy weather.
Water Cycle – a model used to show the water moving to and from the hydrosphere, the atmosphere and the lithosphere.
Weather – the condition of the atmosphere for a short time at a particular place.
Wind – air moving because of convection and density differences in the atmosphere.