An experiment is conducted. An empty flask is taken and clamped in an upside-down position over a beaker of water in such a way that the glass tube dips inside the beaker. The flask is heated at the top. Bubbles of air are observed in the water.
What accounts for the bubbles in the water ?

The air in the flask contracts and spreads out of the flask through the tube into the beaker containing water.

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The air in the flask expands and moves out of the flask through the tube into the beaker containing water.

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The air in the flask remains as it is and the water rises through the tube into the flask.

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None of these

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Solution

The correct option is B The air in the flask expands and moves out of the flask through the tube into the beaker containing water.
As on heating the air expands and occupies more space. And moves out of the flask through the tube into the beaker. Hence we observe bubbles of air in the water.

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An experiment is conducted. An empty flask is taken and clamped in an upside-down position over a beaker of water in such a way that the glass tube dips inside the beaker. The flask is heated at the top. Bubbles of air are observed in the water.What accounts for the bubbles in the water ?

The correct option is B The air in the flask expands and moves out of the flask through the tube into the beaker containing water.As on heating the air expands and occupies more space. And moves out of the flask through the tube into the beaker. Hence we observe bubbles of air in the water.

An experiment is conducted. An empty flask is taken and clamped in an upside-down position over a beaker of water in such a way that the glass tube dips inside the beaker. The flask is heated at the top. Bubbles of air are observed in the water.
What accounts for the bubbles in the water ?

The correct option is B The air in the flask expands and moves out of the flask through the tube into the beaker containing water.
As on heating the air expands and occupies more space. And moves out of the flask through the tube into the beaker. Hence we observe bubbles of air in the water.