In a psychometric chart, what does the vertical lines parallel to the ordinate indicate

24) When two refrigerants are mixed in the proper proportions, the mixture forms a third refrigerant called

25) The average of a, b, c is 20 and that of b, c, d is 25; if d = 30, the value of a is

26) HCF of two numbers is 12 and their product is 288. LCM of the two numbers is

27) Among the following, which statement is incorrect regarding "dehumidification process"?