Adam held the flask for ten minutes. What happened to the ink? Explain.
3. Key words:
held, ten minutes, happened to the ink, explain
The ink dropped initially and rose again. Heat causes expansion. The heat from the hands touched the flask via conduction (contact surface area). This caused the flask to expand first. As the air inside the flask continued to gain heat, the air expanded upon heating, causing the ink to move upwards.
Students will usually write the ink will rise immediately. However, take note that the flask will expand first, though we cannot see with our naked eyes.
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Experiment #7 - Forces (Frictional Force)
Experiment #6 - Forces (Frictional Force)
Experiment #5 - Forces (Interactions)