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# Unit C, Lesson 1

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Powerpoint on how sun affects air temperature

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### Unit C, Lesson 1

1. 1. How Does Sunlight Affect Air Temperature?<br />It’s summer. You wake up and bright sunlight streams in your window. It makes you squint. As the sun rises in the sky, the day gets warmer and warmer. Yes! It’s a beautiful summer day!<br />
2. 2. What is the warmest part of the day?<br />a. Morning<br />b. Afternoon<br />c. Evening<br />Changes in Air Temperature<br />
3. 3. Why Afternoon?<br />The temperature of the air has to do with how much sunlight (light energy from the sun) reaches the earth.<br />Sunlight passes through air…but does NOT heat it!<br />
4. 4. Light energy from the sun hits liquids and solids on the surface of the earth.<br />
5. 5. When liquids and solids get warm, they warm the air above them.<br />
6. 6. Earth’s surface does NOT heat evenly.<br />Why? Well, check it out…<br />
7. 7. The number of hours of daylight also affects air temperature.<br />More Daylight = More Warmth<br />Which season has longer days?Summer or Winter<br />
8. 8. Different surfaces<br />Imagine: <br />It’s one of those really hot days. You decide to go swimming. In your bare feet, you walk across the pavement toward the lake. YIKES! The pavement is hot! You run to the beach. Yow! The sand is almost as hot! Quickly, you head for some grass. Ahh, that’s better! The grass is much cooler than the sand or the pavement.<br />
9. 9. Why was the grass cooler?<br />Different surfaces absorb different amounts of light energy. <br />What does that mean?<br />Some surfaces get hot faster than others.<br />
10. 10. Let’s go back to the beach…<br />The land further away from the ocean heats up more quickly.<br />The ocean heats up more slowly.<br />The air above the land away from the ocean stays warmer.<br />The air above the ocean will stay cooler than the air above the land.<br />
11. 11. Measuring Air Temperature<br />Thermometer<br />When the air around the liquid gets warmer, the liquid gets warmer. <br />When the liquid gets warmer, it spreads out and moves up the thermometer.<br />When it cools, the opposite happens.<br />
12. 12. °C and °F<br />C = Celsius (a metric scale for measuring temperature)<br />F = Fahrenheit (a customary scale for measuring temperature)<br />Higher Number = Warmer temperature<br />Lower Number = Cooler temperature<br />
13. 13. Let’s Review<br />Why are air temperature usually higher in the late afternoon than in the morning?<br />The direct rays of the sun hit the surface of the earth near noon, but it takes time for the surface of the earth to heat the air. Therefore, air temperatures are often higher in the late afternoon than in the morning.<br />
14. 14. Why is the air above the warm surfaces warmer than the air above cooler surfaces?<br />Warmer surfaces heat the air above them more than cooler surfaces do.<br />
15. 15. What causes the liquid in a thermometer to rise in he tube?<br />When warm air around the thermometer heats the liquid, it expands and moves up the tube.<br />
16. 16. Range, Median, and Mode<br />What is the range, median, and mode of this data:<br />90, 80, 76, 66, 98, 85, 76<br />Range = 32<br />Median = 80<br />Mode = 76<br />