03/03/2014

Volume as Function of Temperature:

Heat up the can with water inside, and put it into the water with room temperature. As result, the can rapidly implode because when steam inside the can immediately condenses the inside can become vacuum for a split second. When outside pressure bigger than inside, the can crash by the outside pressure.

In this Lab, we testing the syringe volume change on different temperature. The hot temperature should increase the syringe volume, and cold temperature should decrease the syringe.

Here comes the testing result, and we calculate the flask volume by V= mass/density.

 This is the lab graph shows volume v.s. temperature, and it clearly shows a positive relationship between volume and temperature. The slope is 0.3020 c.c / *C (* = degree)

• V=(nR/P) T, nR/P is just a constant.

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Two previews Lab data:

This is Pressure v.s. Temperature graph, and the slop is 0.2259 kPa / *C.

This is Pressure v.s. Volume graph, and the slop is 32.88 kPa/c.c.

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According to the comparison of formula and data, we know P=C1T is Pressure vs Temperature graph, P=C2T is Volume vs Temperature graph, and P=C3/V is Pressure vs Volume graph. Therefore, C1 = 0.2259 (kPa/*C), C2 = 0.3020 (c.c/*C), and C3 = 32.88 (kPa/c.c). C3 is come from P=C3/V and since it is a downward slop V is up side down, so C3 is just the slope of graph. Next, C4 = (C1 + C2 + C3)^1/2 which can be use one the formula PV/T=C4. As result the coefficient (C4) is 5.77 (unit confusing, guess kPa/*C + c.c./*C+kPa/c.c.)

Testing the difference of balloon volume with different pressure. This one is the normal room pressure.

When pressure decrease the balloon volume increase because balloon's own pressure is bigger than the outsider pressure.

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When pressure increase the balloon volume decrease because balloon's own pressure is smaller than the outside pressure. Additionally, the balloon will goes back to its original size after pressure back to normal.

 Testing the difference of marshmallow volume with different pressure. This one is the normal room pressure.

When pressure decrease the marshmallow volume increase because marshmallow's own pressure is bigger than the outsider pressure.

When pressure increase the marshmallow volume decrease because marshmallow's own pressure is smaller than the outside pressure. But the marshmallow won't back to its original size after pressure back to normal.