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Explain why water boils at a lower temperature (< 100oC) in places where there are high altitudes
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- What is the density of water vapor in g/m3 on a hot dry day in me desert when the temperature is 40.0C and the relative humidity 15 6.00%?A common trick for opening a stubborn lid on a jar is to run very hot water over the lid for a short time. Explain how this helps to loosen the lid.H2O boils at 115°Cat a certain depth. What temperature in K the water will boil if the water is to boil at 75cm below the certain depth.
- (a) At what temperature does water boil at an altitude of 1500 m (about 5000 ft) on a day when atmospheric pressure is 8.59×104 N/m2? (b) What about at an altitude of 3000 m (about 10,000 ft) when atmospheric pressure is 7.00×104 N/m2?A metallic axle with a diameter of 20mm has to be fitted into a wheel which has a circular holeat its center with diameter 18.5mm. To fit the axle into the hole, the axle is dipped into liquidnitrogen at a temperature of -200°C. Calculate the coefficient of linear expansion of the metal. Solve with complete solution.(a) At what temperature does water boil at an altitude of 1500 m (about 5000 ft) on a day when atmospheric pressure is 8.59 X 104 N/m2 (b) What about at an altitude of 3000 m (about 10,000 ft) when atmospheric pressure is 7.00 X 104 N/m2?
- (9) A metal rod made of some alloy is to be used as a thermometer. At OoC its length is 40000cm, and at 1000C its length is 40060cm. (a) What is the linear expansion coefficient of the alloy? (b) what is the temperature when its length is 39975cm?(a) If the partial pressure of water vapor is 8.05 torr, what is the dew point? (760 torr = 1 atm = 101, 325 Pa) (b) On a warm day when the air temperature is 35 °C and the dew point is 25 °C , what are the partial pressure of the water in the air and the relative humidity?On the sea bottom at the Galapagos Rift, water heated to 350 °C gushes out of hydrothermal vents at a depth of 3000 m. Will this water boil or remain liquid at this depth? Assume the enthalpy of vaporization for water to be independent of pressure and temperature.
- (7) A copper rod is 8 m long at 20 °C and has a coefficient of lincar expansion a = 17 x 10-6 (C)-. What is the increase in the rod's length when it is heated to 40°C? rWhy does freezing of water not occur at 0 degree C when foreign ions are present?Question 12 Suppose the earth was twice its current distance from the sun. Recall, the sun's radius is R_sun=7 x 105 km, with a surface temperature of 5800 K., and our distance from the sun is D = 150 million km. Using the equation to model the temperature of R² the earth, ()¹/4Tsun and remembering you have to work in the absolute temperature scale (OK = -273°C) would you expect it to be twice as hot as earth? half as hot as earth the same temperature as earth 0.7 times as hot as earth? 1.4x as hot as earth