Why does hot water rise?

Answer 1

hot water rises because the air bubbles produced by heating the water lower the density of the water, therefore causing it to be lighter than the unheated water.

This is not true. If so, where did the air bubbles come from in, let's say, a home's hot water heater?

The hot water rises because, as it is heated, the molecules move farther apart from eachother making the hot-er water less dense than the cold-er water. Therefore the hot-er water rises and the cold-er water sinks.

I am afraid that the original answer came from someone observing a pan of water heating on a stove. They saw bubbles rising and assumed they were air bubbles, when, in fact, they were tiny bubbles of vaporizing water.

Answer 2

Hot water is less dense than cold water because the molecules have more energy and are further apart. This reduced density causes the hot water to rise, displacing the colder, denser water below it. This upward movement is known as convection.

Answer 3

Sea levels rise because glaciers and ice caps melt and that makes the sea level rise every year.

Another cause the waters rise is because of the gravitational pull that the moon has on the earth. Depending on what side of the earth the moon is on, we will either experience high or low tides.

Answer 4

Water level is determined by the amount of air pressure that is being applied to it. If the same air pressure is applied to two separate but connected bodies of water the level will be the same.
Imagine a garden hose with water in it. As long as there are no kinks in it, the water will be at the same level no matter how high or low either end is. Take that same hose and blow in one end, the person on the other will get a face full of water because the air pressure has changed on the other end.
The same applies when you drink a soda through a straw. By sucking on the straw you change the air pressure compared to the air pressure around it. If you suck on a straw that is connected to a closed system; one that is sealed off from the outside and the result will be different. You may get some some soda, but only until the suction created on the inside of the bottle equals the amount of suction your lungs can achieve.

Answer 5

The vessel the water is in expands when heated thus making the vessel slightly larger. This makes the water appear to shrink, which is what you observe. Water also expands fractionally and soon compensates for this increase in the extra volume of the vessel. The narrower and longer the vessel is, the more pronounced this will be.

Answer 6

Compared to cold water, hot water has less density; therefore it floats on the colder water - it tends to rise. I am not sure whether the situation is the same for molten rock; it likely has less density than non-molten rock, but I am not sure whether that's the only reason it rises.

Answer 7

The water rises, because the particles are moving faster, which makes them separate and take up more space, so the water rises

Answer 8

the process known as convection current is occurring as the water is being heated. The cold, more dense water is sinking and the warmer, less dense water is rising.

Answer 9

the cooler water evaporates into the atmosphere

Answer 10

The liquid in the thermometer must steady its temperature first before measuring the temperature of the warm water as the warm water is hotter.