Will the tiny air bubbles seen before the water actually boils, also appear if we do the boiling water in a vessel activity by reheating boil water kept in an air tight bottle?

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Solution

tiny bubbles are formed when air present in the water escapes on boiling it . Water after boiling if kept in air tight container and then re boiled bubbles wont form due to absence of air

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Question 19.1

Paheli kept some water in a beaker for heating. She observed
that tiny bubbles appeared before the water started to boil.
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down to room temperature.

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Tiny bubbles seen on the surface of boiling water represent:

Q. Sahil was boiling water in a pan for making tea. He observed that during boiling of water some bubbles are formed. According to you what gas is observed by Sahil?

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(a) Boiled or distilled water taste flat.

(b) Ice at $0^{\circ} C .$ has the greater cooling effect than water at $0^{\circ} C .$

(d) Rainwater does not leave behind concentric rings when boiled.

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An experiment was performed to know about the source of air for the aquatic organisms. The experiment was as follows:

Take some water in a glass vessel. Heat it slowly on a tripod stand. Before the water begins to boil, look carefully at the inner surface of the vessel. Observe the bubbles that are coming up. Where are these bubbles coming from?

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