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course Phy 202
Measuring absolute zeroDuring the first hour of class we used the bottles as we did on the first day. This time I measured the temperature of the air in one bottle as it sat outside, then after it was brought in and allowed to sit for a time in the room. We found that its temperature rose from 6 Celsius to 22 Celsius. Water rose in the tubes of the various bottles to heights between 35 cm and 65 cm.
The pressure in the bottle was originally 1 atmosphere, which we will assume to have been 100 000 Pa. So one point on a pressure vs. temperature graph would be (6 Celsius, 100 000 Pa).
Assuming the 'low' estimate of a 35 cm water column, what would be the coordinates of the point on this graph corresponding to temperature 22 Celsius? (start by figuring out how much the pressure had to rise to support a 35 cm column of water).
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Plot these two points on a graph of pressure vs. temperature. Sketch the line through these points and extend it until it reaches the point where the pressure coordinate is zero. What is the temperature coordinate at that point?
Temperature point = -465
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This is your estimate for the 'low' value of the height of the water column.
Repeat assuming the 'high' estimate of 65 cm for water column height.
Temperature point = -248
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Repeat once more, using your measured height.
Temperature point = -350
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