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# As water is cooled its density increases until it reaches about and deg C?

Updated: 9/26/2023

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Q: As water is cooled its density increases until it reaches about and deg C?
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### As water is cooled its density does what until it reaches about 4 C?

As water is cooled its density increases until it reaches about 4 C and then it decreases.

### Why does all the water in a lake have to be cooled to 4 degrees Celsius before water can be cooled below 4 degrees Celsius?

Water in a lake is usually cooled by the cold air above its surface rather than from the ground underneath it. As the top layer of water cools its density increases and so it sinks to the bottom, bringing other water up to the surface. This water is then cooled. This carries on until the temperature reaches 4 deg C when the density reaches a maximum. Further cooling lowers the temperature of the top layer but now its density is less than that of the water below so the top layer stays on top until it freezes (if it is cold enough). That is how you can get lakes with a frozen surface but liquid water below which can sustain aquatic life and also destroy human or other life forms that fall through the ice!

### What happens to the density of water when it gets cold?

Density increases until 4 degrees of celcius.Then decrease again.

### Buoyant air will rise until it?

Buoyant air will rise until it reaches warmer air that is the same density as itself.

### Does the value of sin theta increases as theta increases?

As &theta; increases from 0 to &pi;/2 (90o) sin &theta; increases until it reaches a maximum value of 1 when &theta; = &pi;/2. As &theta; increases from &pi;/2 (90o) to 3&pi;/2 (270o) sin &theta; decreases until it reaches a minimum value of -1 when &theta; = 3&pi;/2. As &theta; increases from 3&pi;/2 (270o) to 3&pi; (360o) sin &theta; increases until it reaches the value of 0 it had when &theta; = 0. From this point, as &theta; increases (by the same amounts) sin &theta; repeats this same cyclic behaviour.

### What happens to gas as it i cooled below 0 degrees C?

It continues to cool until it reaches it's boilng point. At which it will condense then cool further until it reaches it's melting point. It will then continue to cool until it's entropy is minized at absolute zero.

### Does water contract or expand when it is cooled?

When liquid water is cooled, it contracts like one would expect until a temperature of approximately 4 degrees Celsius is reached. After that, it expands slightly until it reaches the freezing point, and then when it freezes it expands by approximately 9%

### Why temperature decreases at height?

Actually, as you go from the surface of the earth to space, temperature decreases until it reaches approximately 15 km( the tropopause). Then it increases until it reaches approximately 50 km ( stratosphere) . then it decreases again until the dheight is about 80 km ( mesosphere), then it increases again in the thermosphere up until 120 km above sea level.

### What happens When water at 0 degree centrigrade is heated?

It melts if has frozen, but far more interestingly, the volume of the water contracts until the temperature reaches 4 degrees C. That is the point of maximum density of water. Once past 4 C, the volume increases slowly (as the density declines) with more added heat.