Match List – I (Definition) with List – II (Term):

List – I (Definition)	List – II (Term)
(A) The ratio of mass of water vapour to the mass of dry air	(I) Absolute Humidity
(B) The ratio of mass of water vapour to the mass of air (dry + water vapour)	(II) Specific Humidity
(C) The ratio of mass of water vapour to the volume of air	(III) Bowen Ratio
(D) The ratio of sensible heat to latent heat fluxes at Earth's surface	(IV) Mixing Ratio

Choose the correct answer from the options given below:

Correct option is C

Introduction:

• Ratio of mass of water vapour to the mass of dry air = Mixing Ratio
• The mixing ratio (r) is defined as the weight (or mass) of water vapor associated with a unit mass of dry air. It is typically expressed in g/kg. It is a "pure" ratio of the components of the mixture.

• Formula:$$r = \frac{m_v}{m_d}$$
• Ratio of mass of water vapour to the mass of air (dry + water vapour) = Specific Humidity
• Specific humidity (q) represents the mass of water vapor per unit mass of the total air parcel (moist air).
• In meteorology, mixing ratio and specific humidity are very close in value because water vapor usually makes up a tiny fraction of the air's mass, but conceptually, specific humidity includes the vapor in the denominator.

• Formula: $$q = \frac{m_v}{m_v + m_d}$$
• Ratio of mass of water vapour to the volume of air = Absolute Humidity
• Absolute humidity (also known as vapor density, $$\rho_v$$​ measures the actual mass of water vapor in a specific volume of air, usually expressed in $$g/m^3$$​.
• Ratio of sensible heat to latent heat fluxes at Earth's surface = Bowen Ratio
• The Bowen Ratio ($$\beta$$​) is a unitless number used to describe the type of heat transfer for a surface. Sensible heat (H) is the energy used to change the temperature of the air, while latent heat (LE) is the energy used for evaporation.

• Formula: $$\beta = \frac{H}{LE}$$​

• ​Formula: $$AH = \frac{\text{Mass of water vapour}}{\text{Volume of air}}$$

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