Using the Laplace formula, calculate the velocity of sound for air. Given γ = 1.4,
ρ = 1.29 kg m−3 and p = 1.01 × 105 Nm−2
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Using the results in (i) and (ii) obtain an expression for viscosity of the gas.
Write the first law of thermodynamics for a gaseous system. Show that the
expression of difference of heat capacities of a gas at constant pressure and at
constant volume is given by
b) 2 kg of water is heated from 0°C to 100°C and converted into steam at the same temperature. Calculate the increase in entropy, given that specific heat of water is
4.18 × 103 J kg−1 K−1 and Latent heat of vaporisation is 2.27 × 107 J kg−1.
Using the Laplace formula, calculate the velocity of sound for air. Given γ = 1.4,
ρ = 1.29 kg m−3 and p = 1.01 × 105 Nm−2
The average energy of helium molecules is ¯E = 2.89 ×10−21J. Calculate their average speed (¯v).
A gaseous system expands from volume V1 to V2 under isobaric conditions.
Calculate the work done in this process.
Define first order phase transition. Derive the Clausius-Clapeyron equation. Plot
(a) entropy, and (b) Gibbs function as a function of temperature for a first order phase transition.
the average height at which a molecule makes its last collision before crossing
the plane is
2λ.
3