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Science We need cotton balls Do Now: 3/12 Can you bring some? Science We need cotton balls Do Now: 3/12 Can you bring some? HW: Read 16-1 and study for.

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Presentation on theme: "Science We need cotton balls Do Now: 3/12 Can you bring some? Science We need cotton balls Do Now: 3/12 Can you bring some? HW: Read 16-1 and study for."— Presentation transcript:

1 Science We need cotton balls Do Now: 3/12 Can you bring some? Science We need cotton balls Do Now: 3/12 Can you bring some? HW: Read 16-1 and study for quiz HW: Read 16-1 and study for quiz 1. Clear your table for the quiz Today ~ TTK 16:1 quiz and check ~ TTK 16:1 quiz and check ~ Complete PPT w/notes: Water in the Air ~ Complete PPT w/notes: Water in the Air

2 The Water Cycle The transfer of water between the atmosphere and Earths surface. 1.Water evaporates from plants and bodies of water 2.Water condenses in the atmosphere and forms clouds 3.Clouds become saturated and water falls as precipitation to the surface 4.Water runs off surface into lakes, streams and oceans.

3 What is Humidity? 1.The amount of water vapor in the air. 2.As water evaporates it becomes water vapor. 3.Water vapor is invisible. 4.Warm air can hold more hold more water vapor water vapor

4 What is Relative Humidity? 1.Amount of water vapor in the air compared to the amount of water the air can hold. 2.A percentage % 3.Air holds all the water vapor it can = Saturated = 100% RH = Saturated = 100% RH

5 Figuring Relative Humidity _actual water vapor content (g/m³)__ X 100 = RH saturation water vapor content(g/m³) 1 m³ of air at 10ºC has 5g of water vapor but, at this temperature it can hold 8g Calculate RH 5 g X 100 = 63% 8 g 8 g Air holds 13g but can hold 25g 13 g X 100 = 52% 13 g X 100 = 52% 25 g 25 g

6 Factors Affecting Relative Humidity 1.The amount of water vapor 2.The temperature If the water vapor stays the same: Temperature goes down RH% up Temperature goes up RH% down

7 How does that work??? At 20 ºC with 15g of water vapor RH = 100% Temperature goes up to 25 ºC air could hold 20g So… 15g (what it has) X 100 = 75% 15g (what it has) X 100 = 75% 20g (what it could have) 20g (what it could have) Temperature ºC Saturated g

8 Measuring Relative Humidity 1. Measured with a psychrometer 2. Has two thermometers * 1 wet bulb * 1 dry bulb Use the dry bulb temp and the chart

9 Determining Relative Humidity Use your book; page 484 Use your book; page 484 Determine the relative humidity for the following days Day DryºC WetºC Differº C RH % Mon1618 Tue1620 Wed1821

10 Determining Relative Humidity Day DryºC WetºC Differ ºC RH % Mon Tue Wed

11 Condensation 1. Water vapor becomes a liquid 2. Happens when air is saturated 3. Air cools to 100% relative humidity

12 Dew Point Temperature at which the air is saturated & condensation occurs Where does the water on the outside of a glass come from??? The cold liquid in the glass cools the air outside of the glass Air next to the glass reaches its Dew Point Water vapor in the air condenses on the glass! Quick Lab: pg 485 What is the dew point temperature in the classroom today?

13 Clouds A collection on millions of tiny water droplets or ice crystals A collection on millions of tiny water droplets or ice crystals Warm air rises cools to dew point Warm air rises cools to dew point water vapor condenses to a liquid/solid water vapor condenses to a liquid/solid Altitude and form/shape Altitude and form/shape

14 Forms of Clouds Cumulus: Fluffy white with Cumulus: Fluffy white with flat bottoms flat bottoms Stratus: Form in layers, cover large Stratus: Form in layers, cover large areas of sky areas of sky Cirrus: Thin, feathery form at high Cirrus: Thin, feathery form at high altitudes altitudes

15 Altitude of Clouds Cirro – forms at high altitude Cirro – forms at high altitude made of ice crystals made of ice crystals Alto – middle altitudes Alto – middle altitudes made of ice crystals & water droplets made of ice crystals & water droplets Low altitudes have no special prefix Low altitudes have no special prefix

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