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Why mercury does not flow?

1. Mercury is a metal and therefore posses metallic bonds.

2. These metal-metal bonds in mercury are not very strong to maintain its solid state but they are strong enough that they do not adhere to floor so that they can flow.

3. If a liquid has to flow, it must adhere to floor weakly but it is not the case in mercury.

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Because it is having a kink near the bulb and the kink does not allows the mercury to fall.
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no, For anything to float on water, it must have to be lighter than the water if both have equal surface area! But in the case of Mercury it's 13.6times heavier than water! So, it will sink in water!
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no,

Mercury is an element, and although it's a liquid at room temperature, it is very heavy. Not only does it sink in water, but heavy solid objects, such as iron cannonballs, will actually float in a pool of the silvery metal.

If you pour a quantity of water and mercury into a container, the water will immediately rise to the top and cover the heavier liquid. This happens because mercury's density is 13.5336 grams per cubic centimeter. This is more than 13 times the density of water, which is 1 gram per cubic centimeter. A unit of mercury therefore weighs over 13 times more than the same unit of water.

 

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