Independent or manipulated variable-what the researcher is changing Dependent or responding variable-what the researcher is observing
Hypothesis: Sand would heat faster and cool faster than water. It was said that water heats extremely slow.
•Cup of sand
•Cup of water
For Your Safety:
-Do not shake the thermometer.
-Wear goggles when experimenting.
-Do not touch the light bulb in the lamp.
1. Obtain all the materials. Place the lamp on a chair. Make sure the lamp is facing down. 2. Place the sand and water (which should be in a cup) underneath the lamp. 3. Place a thermometer in the sand and in the water.
4. Record the temperature before turning on the lamp.
5. Ask an adult to turn on the lamp. Record each temperature every two minutes. Do not take the thermometer out of the sand or water. 6. After ten minutes had passed, turn off the lamp. Now, record the temperature every two minutes until ten minutes had passed. 7. Analyze your data and make a conclusion.
0 24.5 21.0
2 25.5 21.0
4 26.0 21.5
6 27.0 22.0
8 27.0 22.0
10 28.0 23.0
Light Off 12 27.5 23.0
14 27.0 22.5
16 27.0 22.0
18 26.0 22.0
20 26.0 21.5
Analysis of Data: According to the data shown in the table, the highest temperature that the sand reached was 28.0 °C, while the lowest was 24.5°C. The range is 3.5°C. For the water, however, the highest temperature was 23.0, and the lowest was 21.0. The range is 2.0°C. The sand rose 3.5°C in the first ten minutes, and decreased 2.0°C in the next ten minutes. The water rose 2.0°C in the first ten minutes, and fell...