   |
 |
| Hi! this is just a little website about me. i put up whatever i feel like, and sometimes i'm too lazy to put stuff up. deal with it. well, enjoy! ^-^ |
|
 |
|
|
| (aka popsicle-chan) |
| The purpose for our investigation was to test weather sand or water would get hotter, and which one would retain heat better. Our testable question was: Which material, water or sand, will get hotter and retain heat better? In our experiment, we placed 40 ml of sand and water in dishes and put them under a lamp for 10 min, measuring the temperature every minute. After 10 min, we turned off the lamp and let it cool for 10 min, recording the temp still every minute. After the experiment, we collected quantitative data, in the form of temperature and time. We collected the temperature with a thermometer, and we measured the time it took with a stopwatch. The data shows that the sand got hotter and colder faster, and cannot store heat affectively. The water didn�t get as hot as the sand, but it was hotter at the end, and retained heat better. Our hypothesis was supported by our data, and I think it is because the sand has tiny grains, which allows heat to flow in and out easily. The water molecules are much smaller, and they take longer to heat up, since heat can�t get in as well, but they don�t allow any heat to escape, either. To improve the experiment, it would be better if we let the sand and water heat up for longer, and cool off for longer. |
|
23� 24 29 30 30 31 30 30 31 31 29 29 29 28 28 28 28 27 27 27 30� 32 33 35 36 35 36 37 36 40 34 32 31 30 30 29 29 28 28 28 |
|
1. Yes. I am very confident with the procedure I chose. I feel that it allowed us to do everything in a very consistent order, and allowed us to collect accurate data. 2. Because we had a good procedure, I think that we made a graph that accurately represents our data. 3. The data maximums would probably go higher and lower, because the light would be on and off for longer, allowing the sand and water to get colder. 4. This experiment shows that the sun heats up land more than water, but the water in our atmosphere can retain heat better, and that keeps us warm. 5. If we did not have an atmosphere, we would not be able to survive on earth. Obviously, we would not have oxygen to breathe, and other gasses that are important to our survival. We would also be exposed to harmful radiation from the sun, like ultraviolet rays, that could kill us. The atmosphere protects us from the icy black of space, and keeps the earth warm. It protects us from meteoroids, by burning them up when they enter the thermosphere. |