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Water Vapour Volume Expansion Due To Liquid Evaporation in Enclosed
Box Using Digital Balance and Humidity Sensors
Lam Le Ping
Supervisor: Dr. Sunny Goh Eng Giap
Bachelor of Technology (Environment)
School of Ocean Engineering
Universiti Malaysia Terengganu
The volume expansion of water vapour occurred during the transition from liquid to
vapour phase. This circumstance indicated that the water vapour would occupy more
space in the soil spores as compared to the soil water in liquid phase. According to
the concept of basic mass relation, the vapour volume was 43, 578 times greater than
the liquid volume after calculated using the ratio given by Kimball equation. Apart from
the Fick’s law, it was claimed that the expanding volume would convert into vapour
advection. In order to study this phenomenon experimentally, the involved parameters
were the changes of water droplets’ mass and relative humidity in an enclosed box
throughout the experimental duration. In the end, a mathematical equation was
derived to improve the governing equation vapour flux in unsaturated soil.
35 | U M T U N D E R G R A D U A T E R E S E A R C H D A Y 2019