DEW POINT LAB
Name ______________________________________ Per: _____ Date: _________________
|
Dewpoint |
Water Vapor Concentration(grams of water vapor per kilogram of air) |
| 30 | 27.3 |
| 29 | 25.8 |
| 28 | 24.4 |
| 27 | 22.9 |
| 26 | 21.5 |
| 25 | 20.0 |
| 24 | 18.9 |
| 23 | 17.8 |
| 22 | 16.8 |
| 21 | 15.7 |
| 20 | 14.6 |
| 19 | 13.8 |
| 18 | 13.0 |
| 17 | 12.3 |
| 16 | 11.5 |
| 15 | 10.7 |
| 14 | 10.1 |
| 13 | 9.5 |
| 12 | 9.0 |
| 11 | 8.4 |
| 10 | 7.8 |
| 9 | 7.4 |
| 8 | 7.0 |
| 7 | 6.5 |
| 6 | 6.1 |
| 5 | 5.7 |
| 4 | 5.4 |
| 3 | 5.1 |
| 2 | 4.8 |
| 1 | 4.5 |
| 0 | 4.2 |
| -1 | 4.0 |
| -2 | 3.8 |
| -3 | 3.5 |
| -4 | 3.3 |
| -5 | 3.1 |
| -6 | 2.9 |
| -7 | 2.7 |
| -8 | 2.6 |
| -9 | 2.4 |
| -10 | 2.2 |
| -11 | 2.1 |
| -12 | 2.0 |
| -13 | 1.8 |
| -14 | 1.7 |
| -15 | 1.6 |
| -16 | 1.5 |
| -17 | 1.4 |
| -18 | 1.4 |
| -19 | 1.3 |
| -20 | 1.2 |
| -21 | 1.1 |
| -22 | 1.1 |
| -23 | 1.0 |
| -24 | 0.9 |
| -25 | 0.9 |
1. Problem statement: How much moisture is in the air?
2. Research:
2.1 Show example calculations for room dewpoint and relative humidity using:
2.11 Outside temp: _________ F (on ____________ at _____)
2.12 Outside RH: ________ %
2.13 Inside temp: __________ F
2.14 Assuming the outside air is taken in to the building and warmed without changing the amount of water vapor in the air, show your calculations to determine inside RH and dewpoint:
2.141 Convert the temperatures to Celsius: Outside temp ________ C , Inside Temp _______________ C
2.142 Find the outside temperature in the chart on the right to determine how many grams at most COULD BE in the air outside: ____________
2.143 Find the inside temperature in the chart on the right to determine how many grams at most COULD BE in the air inside: ____________
2.144 Convert the outside relative humidity to a decimal and multiply this by the outside "COULD BE" to determine how many grams of water really IS in the air: ______
2.145 Divide the amount of water that "IS" in the air by how much "COULD BE" in the room air then multiply the answer times 100 to estimate the relative humidity of the air in the room:_____________
2.146 Find the amount of water that "IS" in the air in the chart on the right to determine today's dewpoint: ____________
2.2 On lab day _____________________________ Outside RH: ___________ Outside Temperature: ____________ Room temp: ________
2.3 Calculation of Room RH, Dewpoint:
3. Hypothesis: Water vapor in the room air will form condensation at (DP from calculation above): ________________
4. Test
4.1 Materials: Ice, can, water, thermometer
4.2 Procedure: (Homework)
