TABLE 13-3 Saturated Vapor Pressure of Water Saturated Vapor Pressure Тemp- erature (°C) (= mm-Hg) (= N/m³) torr Ра - 50 0.030 4.0 - 10 1.95 2.60 x 102 6.11 х 10? 8.72 x 102 4.58 6.54 10 9.21 1.23 x 103 1.71 × 103 2.33 x 103 15 12.8 20 17.5 25 23.8 3.17 х 103 4.24 x 103 7.37 x 103 30 31.8 40 55.3 50 92.5 1.23 x 104 60 149 1.99 х 104 70* 234 3.12 х 104 80 355 4.73 x 104 90 526 7.01 x 104 100* 760 1.01 × 105 1.99 × 105 4.76 × 105 120 1489 150 3570 Boiling point on summit of Mt. Everest. * Boiling point at sea level.
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
A sauna has 8.5 m3 of air volume, and the temperature is
85°C. The air is perfectly dry. How much water (in kg)
should be evaporated if we want to increase the relative
humidity from 0% to 10%? (See Table 13–3.)
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