To determine the viscosity of liquid by using Ostwald’s Viscometer
1. In the formula η₁ / η₂ = (ρ₁ t₁) / (ρ₂ t₂), η₁ represents:
2. If the viscosity of water at 25°C is 0.89 cP, and the ratio (ρ₁t₁)/(ρ₂t₂) = 1.5, then the viscosity of the test liquid will be approximately:
3. The accuracy of viscosity measurement in an Ostwald viscometer primarily depends on:
4. Before filling the test liquid, the viscometer must be:
5. The relative viscosity of a test liquid is determined by comparing: