Question

A steel blade placed gently on the surface of water floats on it. If the same blade is kept well inside the water ,it sinks. Explain.

Answer 1

because its weight is low and no water come inside blade

Answer 2

If the blade is positioned under the water surface, it can no longer feel surface friction and fall to the bottom because the blade density is greater than that of liquid or water.

Explanation:

• It floats owing to the water surface tension. The water surface acts like an elongated membrane. When a blade is positioned on the surface of the water, due to its low weight it can not pierce the stretched liquid membrane and it stays floating.
• However, if the blade is positioned under the water surface, it can no longer feel surface friction and fall to the bottom because the blade density is greater than that of liquid or water.

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