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Chapter 25 Modern Earth Science

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1 Chapter 25 Modern Earth Science
Weather Chapter 25 Modern Earth Science To insert this slide into your presentation Save this template as a presentation (.ppt file) on your computer. Open the presentation that will contain the image slide. On the Slides tab, place your insertion point after the slide that will precede the image slide. (Make sure you don't select a slide. Your insertion point should be between the slides.) On the Insert menu, click Slides from Files. In the Slide Finder dialog box, click the Find Presentation tab. Click Browse, locate and select the presentation that contains the image slide, and then click Open. In the Slides from Files dialog box, select the image slide. Select the Keep source formatting check box. If you do not select this check box, the copied slide will inherit the design of the slide that precedes it in the presentation. Click Insert. Click Close.

2 Chapter 25 Section 3 Modern Earth Science
Weather Instruments Chapter 25 Section 3 Modern Earth Science

3 Essential Question Identify four instruments that measure lower-atmospheric weather conditions and describe how scientists measure conditions in the upper atmosphere.

4 Weather Instruments Barometer: measures air pressure. (chapter 23)
Psychrometers & hair hygrometers : measure relative humidity. (ch 24) Rain gauge: measures precipitation. (chapter 24)

5 Measuring Air Temperature
Thermometer: used to measure air temperature. 3 common types of thermometers Liquid: expanding & contracting mercury or alcohol indicate rise or fall of temperature. Bimetal: made of 2 strips of metal that bend when heated. Electrical: as temp rises, electrical current increases.

6 Measuring Wind Speed & Direction
Anemometer: measures wind speed Wind vane: indicates wind direction.

7 Measuring Upper-Atmospheric Conditions
radiosonde a package of instruments that is carried aloft by balloons to measure upper atmospheric conditions, including temperature, dew point, and wind velocity The radiosonde sends measurements as radio waves to a receiver that records the information. When the balloon reaches a very high altitude, the balloon expands and bursts, and the radiosonde parachutes back to Earth.

8 Measuring Upper-Atmospheric Conditions, continued
radar radio detection and ranging, a system that uses reflected radio waves to determine the velocity and location of objects For example, large particles of water in the atmosphere reflect radar pulses. The newest Doppler radar can indicate the precise location, movement,and extent of a storm. It can also indicate the intensity of precipitation and wind patterns within a storm.

9 Weather Satellites Satellite images provide weather information for regions where observations cannot be made from ground. The direction and speed of the wind at the level of the clouds can also be measured by examining a continuous sequence of cloud images. Satellite instruments can also measure marine conditions.

10 Computers Before computers were available, solving the mathematical equations that describe the behavior of the atmosphere was very difficult, and sometimes impossible. In addition to solving many of these equations, computers can store weather data from around the world. These data can provide information that is useful in forecasting weather changes.

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