Chapter 2: Understanding the Weather-Quick Revising Notes Social Science Part-1 Class 7 In English-CBSE Notes
Explore NCERT Solutions for Class 7 social science part-1 Chapter Chapter 2: Understanding the Weather Topic Quick Revising Notes with simple explanations and free ncert solution in English.
Chapter 2: Understanding the Weather-Quick Revising Notes Social Science Part-1 Class 7 In English-CBSE Notes
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All Topics Chapter Chapter 2: Understanding the Weather
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Chapter 2: Understanding the Weather-Quick Revising Notes Social Science Part-1 Class 7 In English-CBSE Notes
Chapter 2: Understanding the Weather
Quick Revising Notes
Quick Revision Notes – Understanding the Weather
Weather
- Weather is the condition of the atmosphere at a particular place and time.
- Weather changes from day to day.
- Most weather phenomena occur in the Troposphere, the lowest layer of the atmosphere.
Elements of Weather
- Temperature – How hot or cold the air is.
- Precipitation – Rain, snow, sleet, or hail falling from the sky.
- Atmospheric Pressure – The weight of air pressing on the Earth's surface.
- Wind – Movement of air from one place to another.
- Humidity – Amount of water vapour present in the air.
Traditional Weather Prediction
- People observed nature to predict weather.
- Ants carrying eggs to higher ground may indicate rain.
- Frogs croaking loudly often suggest rainfall.
- Pine cones close in humid weather and open in dry weather.
Temperature
- Temperature tells us how hot or cold the atmosphere is.
- Measured using a Thermometer.
- Common scales:
- Celsius (°C)
- Fahrenheit (°F)
- Digital thermometers provide more accurate readings.
Important Terms
- Maximum Temperature – Highest temperature of the day.
- Minimum Temperature – Lowest temperature of the day.
- Range of Temperature = Maximum Temperature − Minimum Temperature
- Mean Daily Temperature = (Maximum + Minimum) ÷ 2
Precipitation
- Includes rain, snow, sleet, and hail.
- Measured using a Rain Gauge.
- Rainfall is measured in millimetres (mm).
- If 5 mm water is collected, rainfall is recorded as 5 mm.
Atmospheric Pressure
- The pressure exerted by the weight of air.
- Measured using a Barometer.
- Unit: Millibar (mb).
- Normal atmospheric pressure at sea level is about 1013 mb.
- Pressure below 1000 mb may indicate a depression or storm.
Key Facts
- Pressure decreases with altitude.
- Mountain regions have lower atmospheric pressure.
- Low-pressure systems can develop into cyclones.
Wind
- Wind is the movement of air from high-pressure areas to low-pressure areas.
- Two important characteristics:
- Direction
- Speed
Instruments
- Wind Vane – Measures wind direction.
- Anemometer – Measures wind speed.
Importance of Wind
- Helps in weather forecasting.
- Important for farmers, sailors, and pilots.
- Helps in seed dispersal.
Humidity
- Humidity is the amount of water vapour present in the air.
- Measured using a Hygrometer.
- Expressed as Relative Humidity (%).
Humidity Levels
- Dry weather: 20% – 40%
- Humid weather: 60% – 80%
- Saturated air: 100%
Effects of Humidity
- High humidity slows evaporation.
- Wet clothes dry slowly in humid weather.
- People sweat more in humid conditions.
Weather Station
- A weather station contains instruments used to measure weather elements.
- Records temperature, rainfall, humidity, pressure, and wind.
- Helps scientists monitor and forecast weather.
Automated Weather Station (AWS)
- Works automatically without human intervention.
- Uses sensors to collect weather data.
- Provides accurate and timely information.
- Used in agriculture, aviation, navigation, and disaster management.
Predicting the Weather
- Scientists who study weather are called Meteorologists.
- The study of weather is called Meteorology.
- Weather forecasts help predict future weather conditions.
Importance of Weather Forecasts
- Warn people about cyclones, floods, and storms.
- Help farmers plan agricultural activities.
- Assist fishermen and sailors.
- Support disaster management efforts.
- Help governments prepare for emergencies.
Weather Instruments and Their Functions
| Instrument | Measures |
|---|---|
| Thermometer | Temperature |
| Rain Gauge | Precipitation (Rainfall) |
| Barometer | Atmospheric Pressure |
| Wind Vane | Wind Direction |
| Anemometer | Wind Speed |
| Hygrometer | Humidity |
Important Terms
- Weather: Condition of the atmosphere at a specific place and time.
- Meteorology: Scientific study of weather.
- Forecast: Prediction of future weather.
- Water Vapour: Water in gaseous form.
- Hail: Small balls of ice falling from clouds.
- Sleet: Frozen or partially frozen rain.
- Humidity: Amount of moisture in the air.
Exam Booster Facts
- Weather occurs mainly in the Troposphere.
- Rainfall is measured in millimetres (mm).
- Normal sea-level pressure is 1013 mb.
- Wind moves from high pressure to low pressure.
- Humidity is measured by a Hygrometer.
- Wind speed is measured by an Anemometer.
- Rainfall is measured by a Rain Gauge.
- Atmospheric pressure is measured by a Barometer.
- The study of weather is called Meteorology.
- Weather forecasts help reduce disaster risks.
All Topics Chapter Chapter 2: Understanding the Weather
Chapter 2: Understanding the Weather-Quick Revising Notes Social Science Part-1 Class 7 In English-CBSE Notes
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CBSE Notes for Class 7 social science part-1 Chapter Chapter 2: Understanding the Weather – Quick Revising Notes
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