Correct Answer - Option 2 : Hygrometer
Humidity:
- Humidity is the intensity of water vapour that's present in the air.
- Water vapour is the last or gaseous state of water, is generally invisible to the human.
- Humidity indicates the likelihood for dew, precipitation or fog to be present.
Hygrometer:
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A hygrometer is used to measure relative humidity.
- The relative humidity is measured in the air by a hygrometer.
- The relative humidity is represented as a proportion; it represents the amount of humidity in the air, or vapour, to the maximum amount of humidity that the air can possibly contain.
- On a scale of zero to 100, relative humidity is evaluated, the greater the value, the more moisture content in the air.
Thus, to measure humidity, we use a hygrometer.
Relative Humidity:
- Relative humidity tells us how much water vapour is in the air, compared to how much it could hold at that temperature.
- If the relative humidity is 100%, the air is saturated.
- If the relative humidity is 50%, the air contains half the water vapour required for it to be saturated.
- If the amount of water vapour in the air increases, the relative humidity increases, and vice versa.
- If the water vapour content stays the same and the temperature drops, the relative humidity increases.
- If the water vapour content stays the same and the temperature rises, the relative humidity decreases.
- This is because colder air doesn’t require as much moisture to become saturated as warmer air.
Devices
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Purpose
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Pitot tube
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The velocity of flow in rivers or open channel flow velocity measurement.
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Hydrometer |
The relative density of liquids/specific gravity. |
Orifice Meter
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Discharge in a pipe.
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Tensiometer
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The capillary potential of soil water.
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Piezometer
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Measurement of low pressure at any point in pipe flow.
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Thermometer |
The temperature of a body. |
Single column manometer
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Measurement of high pressure at any point in pipe flow.
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Differential manometer
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Measurement of the difference in pressures between two points in a pipe.
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Spring Balance
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Measures weight or Force acting on the object by measuring the tension of a spring.
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Barometer
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Measurement of atmospheric pressure.
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