Heat and Thermodynamics

Question

When we increase temperature then what changes occur in buoyancy force if  (i) body move downward (ii) body move upwards (iii) body remains at same position.

Answer 1

When the body moves downwards, upwards and remains at the same position when we increase temperature.

Let f= fraction of volume of the body submerged in liquid.
\(f = \frac{\text{Volume of body submerged in liquid}}{\text{Total volume of body}}\)
\(f_1 = \frac{v_1}{v_0}\) at θ₁^oC

Case I: Body moves downward if f₂ > f₁ means γ_L>3α_S

Case II: Body moves upward if f₂ < f1 means γ_L < 3α_S

Case III: Body remains at same position if f₂ = f₁ means γ_L= 3α_S

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