NCERT Class 7 Social Science Chapter 2
Understanding the Weather
Weather refers to the day-to-day conditions of the atmosphere at a specific place, including temperature, humidity, rainfall, and wind. This chapter helps students understand how weather is measured, recorded, and how it differs from climate. Students will learn about the instruments used to measure weather elements and how weather affects daily life.
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Key Terms
- Weather
- The short-term atmospheric conditions of a place at a specific time, including temperature, rainfall, humidity, and wind speed.
- Temperature
- The degree of hotness or coldness of the atmosphere, measured in degrees Celsius using a thermometer.
- Humidity
- The amount of water vapour present in the air, which determines how moist or dry the atmosphere feels.
- Precipitation
- Any form of water that falls from clouds to the Earth's surface, including rain, snow, sleet, and hail.
- Barometer
- An instrument used to measure atmospheric pressure, which helps in predicting weather changes.
Frequently Asked Questions
What is the difference between weather and climate?▾
Weather is the day-to-day condition of the atmosphere at a specific place, while climate is the average weather pattern of a place over a long period of about 30 years or more.
What instruments are used to measure weather?▾
Common weather instruments include a thermometer (temperature), barometer (air pressure), hygrometer (humidity), rain gauge (rainfall), and anemometer (wind speed).
Why does weather change every day?▾
Weather changes every day because of the continuous movement of air masses, changes in atmospheric pressure, the rotation of Earth, and the unequal heating of the Earth's surface by the Sun.
What is a weather forecast and how is it made?▾
A weather forecast is a prediction of future weather conditions. It is made by meteorologists using data from weather stations, satellites, and radar to track atmospheric changes and patterns.
What causes rainfall?▾
Rainfall occurs when water vapour in the atmosphere cools down and condenses into water droplets, forming clouds. When droplets become heavy enough, they fall as rain.
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