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The question makes an erroneous assumption. Depending on what you mean by "hot", hot water is notheavier than cold water.
If we look at common household temperatures and you weigh one gallon of room-temperature water (~70ºF) and compare it to one gallon of hot water (~120ºF), you will find that the hot water weighs less than the colder water. That's because the warmer water is less dense -- there aren't as many water molecules per unit volume -- and fewer molecules weigh less than more molecules of the same substance.
On the other hand, water behaves a little differently than many other substances, in that if you cool it below it's point of maximum density (about 39ºF) it starts to become /less/ dense. So if you compare a gallon of water at, say, 34ºF to a gallon of water at 39ºF, the warmer water will weigh morebecause in this range it is more dense than the colder water.
But I'm not sure anyone would call water at 39ºF "hot". :)
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Is it true cold water weighs more than hot water?
bcoz cold water has no vapours n hot water has hot water vapours which dries faster n bcomes lighter than cold water
Which weighs more cold water or warm water?
If you think to density (not weight) hot water is less dense.
Does cold water weigh less than hot water?
No, cold water weighs more (for a given volume) than hot water. This is why there is a thermocline in bodies of water. But when water freezes, the solid form weighs even less (for a given volume), this is why ice floats.
Why does water go down in a cold place and hot water goes up in an airtight place?
In a cold place, water goes down because it is denser when cold, so it sinks. In an airtight place, hot water rises because it is less dense due to expansion from being heated, displacing the denser cold water downwards.
Is sugar more soluble in hot water or cold water?
Hot.
Is statch more soluble in hot or cold water?
hot water
What differences are there when you use hot or cold water in a lava lamp?
hot water contains more energy than cold water. cold water causes the water molegules to vibrate more.
What floats more between cold water and hot water?
The density of cold water is greater than hot water so there will be more substances that will float in it.
Does cold water or hot water hold more oxygen?
Cold water can hold more dissolved oxygen than hot water. This is because the solubility of oxygen in water decreases as the temperature increases. Therefore, cold water has the ability to hold more oxygen than hot water.
Which wakes you up more cold or hot water?
Cold
Which has more sediment hot or cold water?
Normally Hot
What has more energy hot or cold water?
Hot because the atoms in the water are moving much faster then the atoms in cold water.
