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Most fishermen don't. In a large scale it's inefficient, and usually illegal.

Setting of an explosion under water will create a shockwave which will knock the fish out or outright kill it. Much of that fish will then simply float up to the surface where it can be easily collected.

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Does real gold float?

If you throw real gold into a container of water, it should sink down to the bottom quickly. If you see the piece floating on the surface of the water or it takes an unusually long time to sink, it is most likely a fake. Real gold is a heavy metal.


In which state is water most dense?

Water is the most dense in solid (ice) form.


What is the most common state of matter for water?

The most common state of matter for water is liquid.


When energy is transferred from the air to the water what happens to most of the energy?

Most of it will end up in the water It travels through the water.


How does the shape of an object affect its-buoyancy?

The density of water is about one gram / cc. We will probably agree that if I throw something into water that is less dense than water, such as something made of most woods, it will float. If on the other hand I throw something in made of a material like iron, which is more dense that water, it will sink. Now, for simplicity, let's consider cross sections of things we might put in water. If I throw a wooden baseball bat in water it will float and its cross section will be circular. If I throw a closed book on the surface of water (and it stays closed) its cross section will be more or less rectangular. I hope this is clear. Now suppose I consider a tin can. It's made mostly of iron (is spite of the name) so on the basis of my experience with nails I might expect it to sink. But you and I know it will float. Take its cross-section which is something like a 'U'. If I consider this shape I see that part of it is made up of iron-and part of it is air! So the overall density of this cross-section is less than that of iron because air is so 'light'. In fact, the density of this cross section is low enough that it is lower than the density of water and it floats. How can we apply this? The simplest way would be to examine any object of interest a slice at a time from one end of it to the other. For each slice work out its density and compare that with the density of the water that would fit in the same space. You now have the basics.