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weather
| Term | Definition |
|---|---|
| weather | the condition of earths atmosphere at a particular time and place |
| meteoroligist | scientist who study the cause of weather and try to predict it |
| forecast | a prediction of what the weather will be in the future |
| tempature | the average amount of energy of motion in the molecules of a substance |
| convection | the transfer of heat by movement of fluid |
| humidity | a measure of the amount of water vapor in the air |
| relative humidity | the percentage of water vapor in the air compared to the maximum amount the air can hold at that tempature |
| wind | the horizontle movement of air from an area of high pressure to an area of lower pressure to an area of lower pressure |
| cumulus | clouds that form less than 2 kilometers above the ground and look like fluffy rounded piles of cotton |
| stratus | clouds that form in flat layers |
| cirrus | wispy,feathery clouds made mostly of ice crystals that form at high levels,above about 6 kilometers |
| thermometer | an instrument used to mesure tempature,consisting ofthin,glass tubes with a bulb on one end thatcontains a liquid |
| anemometer | an instrument used to mesure wind pressure |
| phychrometer | an instrument used to measure relative humidity,consisting of a wet-bulb thermeter and a dry-bulb thermometer |
| air mass | a huge body of air that has simular tempature,pressure,and humidity throughout |
| front | the area where air masses meet and do not mix |
| cold front | when a cold air masses pushes against a warm air mass |
| warm front | when a warm air mass pushes against a cold air mass |
| tornado | a rapidly whirling,funnel-shaped cloud that reaches down from a storm cloud to touch earths surface leaving a destructive path |
| hurricane | a tropical storm that has wind of 119 km per hour or higher typically about 100 km across |