6th Gr.Science Vocabulary Weather

meteorology the science and study of the atmosphere and atmospheric phenomena
Temperature The measure of molecular motion or degree of heat of a substance
Humidity The amount of water vapor in the air
wind direction the direction from which the wind is blowing
wind speed the rate of the motion of the air on a unit of time. knots per hour, nautical miles per hour and miles per hour
pressure force per unit area exirted by the weight of the atmosphere above or below a point at the earth's surface
visibility measure of opacity of the atmosphere greatest distance one can see objects with normal eyesight
Thermometer instrument that measures temperature
Hygrometer instrument to measure water vapor sat_flash_1 in the atmosphere
wind vane an instrument that indicates wind direction
barometer instrument used to measure air pressure
anemometer instrument that measures speed and the force of the wind
atmosphere gaseous (air) portion of physical environment that surrounds a planet
weather a state of atmosphere at a specific time relative to life and human activities, cloudiness, humidity, precipitation, temperature, visibility and wind
Air pressure the force of air pushing in all directions
stratosphere the layer of air above the troposphere
Troposphere the layer of air where almost weather occurs, the layer we live in, which is a mixture of nitrogen, oxygen, & other gases.
rotation earth spinning around once on it's axis
revolution the spinning of one object around another object
mass/weight how heavy an object is
beam spreading a light fixture that spreads out as the distance increases
solar angle the altitude of the sun in the sky in degrees down from the zenith or straight overhead.
compression the act of compressing or being compressed
forecast statement of expected future occurrences of weather
water cycle the ongoing cycle of evaporation, condensation & precipitation.
dew point the temperature needed for the air to become saturated with water.
evaporation when a liquid turns into a gas.
precipitation water that falls from the sky—rain, snow, sleet, hail
condensation when a gas turns into a liquid.
humidity the amount of water vapor in the air.
relative humidity how much water vapor is in the air compared to how much water vapor it would take to saturate the air.
saturated when the air is holding all of the water vapor that it can possibly hold.
water vapor when water turns into a gas.
dew a form of condensed water vapor.
frost ice crystals that form on objects.
transpiration the process by which water in plants is transferred as water vapor to the atmosphere.
conduction the transfer of heat through a substance by molecular action or from one substance by being in contact with another.
convection motions in a fluid that transport and mix the properties of the fluid.
radiation the process by which energy is propagated through any medium by virtue of the wave motion of that medium.
blizzard a long-lasting snowstorm with very strong winds & intense snowfall.
snowflakes six-sided ice crystals that form in clouds where the temperature is below freezing.
sleet rain drops that freeze into ice pellets before reaching the ground.
freezing rain rain that falls onto a surface with a temperature below freezing.
solstices days when the Sun reaches its farthest northern & southern declinations.
equinoxes days in which day and night are of equal duration.
Summer Solstice June 21 — first day of summer — longest day of the year—Earth is tilted toward the Sun.
Winter Solstice Dec.21 — first day of winter — shortest day of the year — Earth is tilted away from the Sun.
Vernal Equinox March 21 — first day of spring — Sun is at the Equator —12 hours of day & 12 hours of night.
Autumnal Equinox Sept. 23 — first day of autumn — Sun is at the Equator — 12 hours of day & 12 hours of night.
elliptical not perfectly round.
perihelion the closest point of Earth and the Sun, occurs on January 3, The North Pole is leaning away from the Sun.
aphelion the farthest point of Earth and the Sun, occurs on July 4, The North Pole is leaning towards the Sun.
density the amount of matter in a volume of material.
heat molecular motion

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