Removing of Some Errors for Measuring the Specific Latent Heat of Vaporization of Water in the Lab

This paper discusses on typical errors of measuring the specific latent heat of vaporization of water in the lab of schools or university. This experiment is very sensitive to the mass of vapour that arrives inside the calorimeter. In general what enters the calorimeter is composed of vapour, cloud and even water drops. The usual methods for this measurement don’t prevent fog and water, thus don t enter pure vapour inside the calorimeter; therefore these methods have errors that we can prevent them simply. In this paper, we report the method for modifying the path of vapour towards calorimeter that with a high reliability, the mass of water and cloud that enter the system decreases considerably and very pure vapour of water enters the system.