Amass transfer experiment is run to determine the mass transfer coefficient of water into air. air is flowed across a pan of water, which is on a balance. as water evaporates, mass is transferred into the air and the balance measures a loss in water mass. let a = water (�h = 18 �⁄���) and b = air (�p = 29 �⁄���). air at 50 cm/s and 30ºc, with 10% relative humidity, flows in a chamber pressurized to 1.1 bar. the air flows across a pan of length l = 30 cm and width w = 10 cm. after 5 minutes, the balance reads that approximately 1 gram of water has been lost. relevant information: �h _`a(30º�) = 4.247 ���. determine the mass transfer coefficient, in cm/s

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.