| A | B |
|---|
| barometer | a device that measures air pressure. |
| 350 Years ago | First barometer made by accident |
| Evangelista Torriceli | accidently invented the mecury baramoter |
| air pressure | push of air against its surroundings |
| sea level | particles of air are closer together |
| air | is matter |
| higher air presure | closer the air particles are to each other |
| air pressure in denver | is lower than the air pressure in Boston |
| types of Barometers | mercury and aneroid |
| aneroid barometer | made with a sealed metal can |
| aneroid barometers | when the can expands or contracts when air pressure changes |
| Air pressure is measured | in inches of mecury |
| 29.92 "(75.99CM) | stanard air pressure |
| air particles that are far apart | low air pressure |
| heated air in closed space | increase in air pressure |
| warm outside air (like today) | lower air pressure |
| high-pressure areas | areas where surrounding pressure is higher than the surrounding air |
| Low-pressure areas | areas where surrounding pressure is lower than the surrounding air |
| difference in pressure between high and low areas | cause winds |
| wind blowing from the east to the west | East wind |
| wind vane | a device that shows wind direction |
| wind vane pointing south | South wind |
| windsock | cloth bage narrow st one end, open at both ends denotes wind direction |
| Created by a greater difference in air pressure between tw areas | stronger winds |
| anemometer | measures wind speed |
| Beaufort scale | a scale that divides wind strength in 12 categories |
| Sir Francis Beaufort | British Naval Office who in 1805 created the beaufort scale. |
| windmills | machines that put wind to work |
| wind turbines | modern day windmills that attached to a generator produce electricity |
| wind farm | 50 or more wind turbines working together |
| three state of water | Solid(ice), liquid, gas (air vapor) |
| water cycle | The movement of water into the air as vapor and back to the eath as rain, snow or hail |
| evaporation | the process of water changing from a liquid to a gas |
| condensation | water changes from a gs to a liquid |
| cloud | billions of tiny drops of water that condensed from the air |
| fog | a cloud that touches earth |
| precipitation | any form of water that fells from the air |
| Sun's energy causes | evaporation |
| rain gauge | a device that measures precipitation |
| humidity | water vapor in the air |
| relative humidity | amount of water vaopr the air is holding compared to the amount it could hold at that tempertature |
| outside temperature high, humidity low | feel good temps - sweat evaporates quickly |
| Temperature high, humidity high | very uncomfortable feeling as water on your skin does not evaporate |
| lightning | static electricity released as a lash of light and heat |
| thermometer | Instrument that measures how hot or cold air is |
| Tornado | A violent funnel shaped storm of spinning wind |
| Nitrogen | a gas that makes up 4/5 of the air |
| Hurricane | Alarge violent storm with winds, and heavy rains. It is formed over warm water |
| Oxygen | A gas making up about 1/5 of the air |
| Flash Flood | A sudden violent flood |
| Carbon Dioxide | a colorless, orderless gas that plants use to make food |
| Thunderstorm | also called thunderhead. Lighting, thunder, rain, winds |
| Water vapor | Water in the form of gas |
| Atmosphere | The balnket of air surrounding earth |
| Warm front | The leading edge of a warm air mass that forms as a warm air mass moves into a cold air mass |
| Troposphere | The layer of th atmosphere closest to the surface of the earth |
| air mass | A large body of air that has about the same temperature . air pressure, and moisture throughout |
| Weather | The condition of the atmosphere at a certain place and time |
| front | The place where two air masses meet |
| cold front | The leading edge of a cold air mass that forms as the cold air mass moves into the war air mass |
| Greenhouse effect | Process by which heat from the sun builds up near earth's surface and is trapped by the atmosphere |
| Weather Forecaster | A person who makes weather predictions or reports conditions |
| wind | The movement of air from an area of high pressure to an area of low pressure |
| cirrus | Thin, feathery clouds made of ice crystals high in the sky |
| cumulus | A large, white puffy cloud. Fair picnic weather |
| Mercury | Liquid used in Toricelli's baraometer |
| Denver | The mile high city |
| stratus | A low, flat cloud that often drizzle, like a blanket covering the sky |
