Air Mass Density and Specific Weight Quiz

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Questions and Answers

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?

<p>Ratio of specific humidity at a given condition &amp; at saturated conditions (A)</p> Signup and view all the answers

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

<p>Entropy of air (D)</p> Signup and view all the answers

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

<p>$0.622 \times X (P - Ps)$ (B)</p> Signup and view all the answers

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

<p>Nitrogen (A)</p> Signup and view all the answers

What is the formula for mass density of air?

<p>𝜌 = m/V (C)</p> Signup and view all the answers

What is the main difference between gas and vapor?

<p>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. (C)</p> Signup and view all the answers

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

<p>Specific Weight (D)</p> Signup and view all the answers

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

<p>Specific Gravity (B)</p> Signup and view all the answers

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

<p>Sg = ρair/ρgas (A)</p> Signup and view all the answers

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

<p>Oxygen (A)</p> Signup and view all the answers

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

<p>Pa (B)</p> Signup and view all the answers

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

<p>Nitrogen (A)</p> Signup and view all the answers

Which temperature scale includes the absolute zero point?

<p>Kelvin (K) (D)</p> Signup and view all the answers

What parameter quantifies the mass of air per unit volume?

<p>Mass Density (C)</p> Signup and view all the answers

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

<p>Internal energy is greater than enthalpy (A)</p> Signup and view all the answers

How can the Rankine value be calculated from Fahrenheit?

<p>$R = t[°F] + 459$ (B)</p> Signup and view all the answers

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

<p>Kinematic viscosity includes density, while absolute viscosity does not (A)</p> Signup and view all the answers

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

<p>Increase in molecular movement (B)</p> Signup and view all the answers

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

<p>'x' represents the proportion of water vapor in the air (C)</p> Signup and view all the answers

Which unit is used to express kinematic viscosity?

<p>m/s (A)</p> Signup and view all the answers

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

<p>Buoyancy principle (B)</p> Signup and view all the answers

Flashcards

𝐻𝑟 in dry/wet bulb equation

Relative humidity

Role of coefficient A

Measuring humidity

What 'x' stands for

Weight of water vapor per unit weight of dry air

μ meaning

Ratio of specific humidity at a given condition & at saturated conditions

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Total heat content parameter

Entropy of air

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How to calculate 'x'

  1. 622 × X (P - Ps)
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Most abundant gas

Nitrogen

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Mass density of air

𝜌 = m/V

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Gas vs 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.

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𝛾 meaning

Specific Weight

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Heaviness of air per unit volume

Specific Gravity

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Specific gravity formula

Sg = ρair/ρgas

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Air for QC

Oxygen

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Unit of pressure difference

Pa

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Highest Proportion By Weight

Nitrogen

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Absolute zero scale

Kelvin (K)

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Mass per unit volume

Mass Density

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Enthalpy vs Internal Energy

Internal energy is greater than enthalpy

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Fahrenheit to Rankine

R = t[°F] + 459

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Kinematic vs Dynamic Viscosity

Kinematic viscosity includes density, while absolute viscosity does not

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Viscosity increase with temp

Increase in molecular movement

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Humidity ratio 'x'

'x' represents the proportion of water vapor in the air

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Kinematic viscosity unit

m/s

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Densimeter principle

Buoyancy principle

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