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Unformatted text preview: Heat and Thermodynamics Prelab 1 Temperature and Pressure The pressure in a container of fixed volume V is 20 psi when the temperature is 20 ◦ C. What is the pressure when the temperature is ◦ C? What is the pressure when the temperature is 100 ◦ C? 1.1 Equations The ideal gas law states that PV = nRT where P is the pressure in the container of volume V , the volume contains n moles of an ideal gas, R is the universal gas constant, and T is the temperature in kelvin . The relationship between a temperature expressed in kelvin and a temperature expressed in Celcius degrees is T Kelvin = T Celcius + 273 . 15 1.2 Room Temperature Let us call the known temperature and pressure P 1 and T 1 . P 1 = 20 psi The temperature T 1 is given in Celcius degrees; we need to write it in kelvin. T 1 = 20 ◦ C = (20 + 273 . 15) K = 293 . 15 K The container is of fixed volume V . You should assume the container is closed and no gas is flowing into or out of it. The number of moles n of the gas is therefore constant. Theof the gas is therefore constant....
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