Question:
Humidity means amount of in air.
Humidity means amount of in air.
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Humidity $=$ water vapour content of air. The instrument used to measure relative humidity is called a hygrometer. A relative humidity of 100% means the air is saturated with water vapour (it cannot hold any more), and condensation (dew, fog, rain) begins. At 0% RH, the air is completely dry.
Updated On: Jun 10, 2026
- Oxygen
- Dust
- Water vapour
- Nitrogen
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The Correct Option is C
Solution and Explanation
Concept:
Humidity is a meteorological and physical science term that specifically refers to the presence of
water vapour (gaseous water) in the atmosphere/air. It is a measure of how much water vapor the air contains and is crucial for understanding weather, climate, and human comfort.
Step 1: Define humidity precisely.
Humidity is the concentration of water vapour present in the air. It is expressed in several ways:
• Absolute Humidity: the actual mass of water vapour per unit volume of air (g/m$^3$).
• Relative Humidity (RH): the ratio of the current water vapour pressure to the maximum (saturation) water vapour pressure at that temperature, expressed as a percentage.
• Specific Humidity: mass of water vapour per unit mass of moist air (g/kg).
Step 2: Why not the other options?
• (A) Oxygen: The amount of oxygen in air is described by its partial pressure or concentration, not humidity. Oxygen makes up approximately 21% of dry air and is relatively constant.
• (B) Dust: Dust particles in air are described by particulate matter (PM) levels or air quality indices, not humidity. Dust has no relation to humidity.
• (D) Nitrogen: Nitrogen constitutes approximately 78% of dry air and its amount is not described by humidity.
Step 3: Significance of humidity.
• High humidity makes it feel hotter because sweat doesn't evaporate easily.
• Low humidity can cause dry skin, respiratory problems, and static electricity.
• Humidity affects many physical and chemical processes, including corrosion rates, food preservation, and plant growth.
• Monsoon weather is characterized by very high relative humidity.
Humidity is a meteorological and physical science term that specifically refers to the presence of
water vapour (gaseous water) in the atmosphere/air. It is a measure of how much water vapor the air contains and is crucial for understanding weather, climate, and human comfort.
Step 1: Define humidity precisely.
Humidity is the concentration of water vapour present in the air. It is expressed in several ways:
• Absolute Humidity: the actual mass of water vapour per unit volume of air (g/m$^3$).
• Relative Humidity (RH): the ratio of the current water vapour pressure to the maximum (saturation) water vapour pressure at that temperature, expressed as a percentage.
• Specific Humidity: mass of water vapour per unit mass of moist air (g/kg).
Step 2: Why not the other options?
• (A) Oxygen: The amount of oxygen in air is described by its partial pressure or concentration, not humidity. Oxygen makes up approximately 21% of dry air and is relatively constant.
• (B) Dust: Dust particles in air are described by particulate matter (PM) levels or air quality indices, not humidity. Dust has no relation to humidity.
• (D) Nitrogen: Nitrogen constitutes approximately 78% of dry air and its amount is not described by humidity.
Step 3: Significance of humidity.
• High humidity makes it feel hotter because sweat doesn't evaporate easily.
• Low humidity can cause dry skin, respiratory problems, and static electricity.
• Humidity affects many physical and chemical processes, including corrosion rates, food preservation, and plant growth.
• Monsoon weather is characterized by very high relative humidity.
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