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The answer lies at the molecular level. When a substance is heated, the heat energy is absorbed by the molecules from which the substance is comprised. The heat energy is then transformed into the kinetic energy of the molecules - in other words they move faster. This motion of the molecules is referred to as Brownian motion. The motion of a molecule, however, is random and so it continually collides with other molecules.
Now imagine a fluid comprised of a dense cloud of molecules. As the molecules begin to collide with one another at a faster rate, they begin to push each other apart. Therefore, if you heat a cubic foot of molecules, some percentage of the total number gets pushed outside the cubic foot boundary. When there are fewer molecules in the cubic foot, the cubic foot weighs less than it did before it was heated - it becomes less dense.
It is worth noting here that water is a unique fluid. As it cools, it becomes more dense like every other substance. When it becomes solid (ice), though, it suddenly expands becoming less dense. That is why the stuff floats. If it didn't behave in this manner, lakes, rivers, and seas would freeze from the bottom up and marine life as we know it couldn't exist. That is another topic, though.
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Where cool dense water sinks does it become more dense?
In the Mediterranean Sea the cool dense water sinks under less dense water which is called density current.
Why are el nino waters less dense than those of the surrounding ocean?
El Nino waters are less dense because the waters are warmer and warm water is less dense than cool water. Also, it constantly rains over the ocean during the El Nino, and rain water is less dense than ocean water.
Why is cool and dry air often called a high?
It is called a "high pressure region". Air that is cool, is dense. Air that has less moisture is more dense than air with more moisture.
Is warm air dense?
No, warm air is lighter than cold air because hot air rises and cold air stays in the same place.
What is less dense warm air or cold air?
Warm air is less dense (lighter) than cold air..that is why warm air rises and cold air settles
Where cool dense water sinks does it become more dense?
In the Mediterranean Sea the cool dense water sinks under less dense water which is called density current.
Is cool air less dense?
No it is more dense than hot air
Why do things float and some things sink?
Things that float in a fluid are less dense than the fluid. Things that sink in a fluid are more dense than the fluid.
What is true A warm air is less dense than cool air B warm air is as dense as cool air. C warm air has no density. D warm air is denser than cool air?
Warm air is less dense than cool air.
If an object's density is is less than that of the fluid what will happen?
it will float providing it is in that fluidIt will float on the surface of the fluid.
What law determines an object will float or sink in a fluid?
An object will float in a fluid if it is less dense than that fluid, because the mass of that object displaces less of the fluid than is the volume of the object. An object denser than that fluid would continue to displace the fluid until it met something either solid or more dense.
What song says I love money and she love me back?
well if it is less dense or cool dense than a tornado forms in a wet cool place.
Can a viscous fluid be less dense then fresh water?
Yes, for example oil is less dense than water even though it is more viscous.
Why is warm air less dense than cool air?
Sooo many fingers
If an object is less dense than the liquid it is put into it will?
It will sink in the fluid. It will sink in the fluid.
What is true awarm is less dense than cooler air bwarm air is as dense as cooler air cwarm air has no density dwarm air denser than cool air?
Warm air is less dense than cooler air.
Which air mass is the least dense?
Warm air is less dense than cool air masses because of their density levels.
