1. Relative Humidity Eric Angat Teacher

2. 1. What is Humidity?

3. Humidity is the amount or percent of moisture in air. 40 / 80 = 0.5 or 50% 50%

4. 2. What is Relative Humidity and Absolute Humidity?

5. Absolute humidity is the amount of water vapor in the air. Relative humidity is the amount of water vapor relative to the saturation amount. This is dependent on temperature.

6. 3. How do you use the Relative Humidity Chart? https://www.youtube.com/watch?v=14Q3-VtVDAI

7. 3. How do you use the Relative Humidity Chart? 1.Dry-bulb temperature minus wet bulb temperature= ________. 2.Find this number, the difference in temperature between the dry-bulb temperature and the wet- bulb temperature, at the top of the relative humidity chart and place your finger on it. 3. Find the dry-bulb temperature in the first column on the left. Place your finger on it. 4. Bring your fingers down the column and across the row. The relative humidity

8. 20 C Dry Bulb Thermometer Wet Bulb Thermometer 10 C Start with two thermometers, one dry and the other wet. Wet cloth Subtract the wet-bulb temperature from the dry- bulb temperature. 20 C – 10 C = 10 C

9. Find this number at the top of the chart and place your finger on it. Find the dry-bulb temperature in the first column on the left. 20 C 24 The relative humidity is 23%. 100% relative humidity means it is raining.

10. 28 C Dry Bulb Thermometer Wet Bulb Thermometer 25 C Start with two thermometers, one dry and the other wet. Wet cloth Subtract the wet-bulb temperature from the dry- bulb temperature. 28 C – 25 C = 3 C

11. Find this number at the top of the chart and place your finger on it. Find the dry-bulb temperature in the first column on the left. 28 C 78 The relative humidity is 23%. 100% relative humidity means it is raining.

12. 30 C Dry Bulb Thermometer Wet Bulb Thermometer 27 C Start with two thermometers, one dry and the other wet. Subtract the wet-bulb temperature from the dry- bulb temperature. 30 C – 27 C = 3 C

13. Find this number at the top of the chart and place your finger on it. Find the dry-bulb temperature in the first column on the left. 30 C 79 The relative humidity is 23%. 100% relative humidity means it is raining.

14. 12 C Dry Bulb Thermometer Wet Bulb Thermometer 7 C Wet cloth Subtract the wet-bulb temperature from the dry- bulb temperature. 12 C – 7 C = 5 C

15. Find this number at the top of the chart and place your finger on it. Find the dry-bulb temperature in the first column on the left. 12 C 48 The relative humidity is 23%. 100% relative humidity means it is raining.

16. 4. How can the air hold water?

17. Air is like a sponge. Water molecules can fit between the molecules of air. The hotter it is the bigger are the spaces between air molecules thus more water vapor can fit in.

18. Stratus CirrusPrecipitation Coalescence ______________5. All forms of water that fall from clouds. ______________6. Low, layered clouds which results to rain, snow. ______________7. Small cloud droplets join to form larger ones. _____________ 8. Wispy, high clouds made of ice crystals. Fair weather. ______________9. can be rain, snow, freezing rain, and sleet. StratusCirrusPrecipitationCoalescencePrecipitation