Question

Take a glass vessel and pour some glycerine into vessel and next pour water up to the brim. Take a quartz glass rod. Keep it in the vessel. Observe glass rod by the sides of glass vessel. i) What changes do you notice ? ii) What could be the reasons for these changes ?​

Answer 1

Answer:

When we put some acetone or petrol or perfume on our palm, it evaporates. During evaporation, particles of the liquid absorb energy from the surface of the palm to compensate for the loss of energy, making the surroundings cool. The acetone, petrol or perfume take this latent heat of vaporisation from our palm.