Air Mass Density and Specific Weight Quiz

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What does the 𝐻𝑟 represent in the dry and wet bulb equation?

Saturation vapour pressure

Atmospheric pressure

Specific humidity

Relative humidity (correct)

What is the role of coefficient A in the dry and wet bulb equation?

Saturation vapour pressure

Measuring humidity (correct)

Atmospheric pressure

Specific humidity

In the specific humidity formula, what does 'x' stand for?

Total heat content of air

Entropy of air

Difference between dry-bulb and wet-bulb temperature

Weight of water vapour per unit weight of dry air (correct)

What does the symbol 'μ' represent in the context of atmospheric pressure?

Ratio of specific humidity at a given condition & at saturated conditions Signup and view all the answers

Which parameter is used to calculate the total heat content of air?

Entropy of air Signup and view all the answers

How is 'x' calculated in terms of atmospheric pressure and saturation?

$0.622 \times X (P - Ps)$ Signup and view all the answers

Which gas makes up the majority of Earth's atmosphere by volume?

Nitrogen Signup and view all the answers

What is the formula for mass density of air?

𝜌 = m/V Signup and view all the answers

What is the main difference between gas and vapor?

Vapor is the gaseous state of a substance that is usually a liquid or solid at room temperature, whereas gas refers to any substance that is in a gaseous state at a given temperature and pressure. Signup and view all the answers

Which parameter is represented by the symbol 𝛾 in the given text?

Specific Weight Signup and view all the answers

Which parameter is used to quantify the heaviness of air per unit volume?

Specific Gravity Signup and view all the answers

What is the formula for specific gravity in relation to air?

Sg = ρair/ρgas Signup and view all the answers

What component of air is considered for quality control calculations as 21%?

Oxygen Signup and view all the answers

What is the unit of pressure difference as mentioned in the text?

Pa Signup and view all the answers

Which gas has the highest proportion in Earth's atmosphere by weight?

Nitrogen Signup and view all the answers

Which temperature scale includes the absolute zero point?

Kelvin (K) Signup and view all the answers

What parameter quantifies the mass of air per unit volume?

Mass Density Signup and view all the answers

What is the relationship between enthalpy and internal energy in the context provided?

Internal energy is greater than enthalpy Signup and view all the answers

How can the Rankine value be calculated from Fahrenheit?

$R = t[°F] + 459$ Signup and view all the answers

In the context provided, how does the kinematic viscosity of air differ from absolute or dynamic viscosity?

Kinematic viscosity includes density, while absolute viscosity does not Signup and view all the answers

Why does the viscosity of air increase when its temperature rises?

Increase in molecular movement Signup and view all the answers

What is the significance of the humidity ratio 'x' in calculating the enthalpy of air?

'x' represents the proportion of water vapor in the air Signup and view all the answers

Which unit is used to express kinematic viscosity?

m/s Signup and view all the answers

What principle underlies the measurement of air density using a densimeter?

Buoyancy principle Signup and view all the answers