Equipment: 200mL beaker, water, tweezers, a crystal of potassium permanganate, drinking straws, Bunsen burner, heat mat, tripod, and gauze mat.
Method:
1. Set up a bunsen burner on a heatproof mat. Put the gauze mat on the tripod but leave it just to one side of the Bunsen Burner.
2. Fill a 200 mL beaker with 150 mL of cold water.
3. Place the beaker on top of the tripod and gauze and allow it to settle for a few minutes.
4. Carefully insert a drinking straw down one side of the beaker, ensuring the straw is touching the bottom of the beaker. Be careful as you do not want to disturb the water too much.
5. Using tweezers, drop a crystal of potassium permanganate down the inside of the straw. Wait for the crystal to settle on the bottom of the beaker.
6. Very gently, so to not disturb the water, remove the straw.
7. Light the Bunsen and slide it under the tripod so that you are only hearing the outside of the beaker were the crystal is. Observe.
Observation: The potassium permanganate the colour of it—which is purple—spread out faster to the hot part where the Bunsen burner was put on below the beaker. Lastly, the potassium permanganate went to a spiral direction when we've put it in the beaker and heated
Explanation/Conclusion:
Observing Convection II
When the water particles rise, space increases. Which makes this part of the water inside the beaker becomes less dense. For instance, cold water—and denser—comes in or flows in order to replace the water particles that rose; or what we call convection current.
Aim: To observe convection in Gas.
Equipment: Scissors, paper spiral pattern, string, a source of heat (boiling water, radiator, etc.)
Method:
1. Cut out the spiral pattern.
2. Punch a hole in the middle.
3. Add string.
4. Ready a source of heat to use.
2. Punch a hole in the middle.
3. Add string.
4. Ready a source of heat to use.
Observation:
The spiral pattern that we cut out, moved to a spiral direction when we put it 30cm above the fire.
The spiral pattern that we cut out, moved to a spiral direction when we put it 30cm above the fire.
Explanation:
Heating air causes the air molecules to travel farther apart, thereby making the air less dense. Less dense air will always rise above dense air. As the warm, lighter, air rises upwards the paper spiral begins to spin. This process keeps working because the cooler air surrounding air keeps coming towards the fire and warms up.
Heating air causes the air molecules to travel farther apart, thereby making the air less dense. Less dense air will always rise above dense air. As the warm, lighter, air rises upwards the paper spiral begins to spin. This process keeps working because the cooler air surrounding air keeps coming towards the fire and warms up.
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