What is the only substance on this planet that increases in size when heated and frozen?

Answer 1

You're looking for the answer Water (H2O), but thats not the only substance.

This behaviour is called anamolous expansion- expanding with increasing temperature in one range of temperature, and shrinking with increasing temperature within another range.

Most of the metals used for minting coins show this behaviour - that is exactly why they are used for minting... When they freeze from molten metal to solid metal, they expand and fit into the cast well.. Copper and nickel are examples of this. But when you heat the cold metal, they expand.

Water is the only LIQUID that displays this property.

Answer 2

Water with Chemical Formulae (H2O):

WATER would seem to be relatively easy for scientists to understand. It is the only natural substance on Earth that is found as a gas, liquid, and solid. It covers 70 percent of Earth’s surface, makes up 60 percent of the human body, and constitutes 90 percent of a person’s blood.

However, the water molecule is far from simple. Given its low molecular weight, water at ambient conditions should be a gas instead of a liquid. Its boiling point is nearly 200°C higher than expected compared with similar-size molecules. And, unlike most substances, when ice melts, the water molecules pack more closely together than they do when frozen, which is why ice cubes float. In addition to its familiar liquid phase, water has at least 3 other liquidlike phases and up to 14 solid phases.

Water’s unusual properties have unexpected effects on the thermodynamic behavior of its phases. For example, temperature and pressure affect the molecules differently when water approaches its boiling point than when it is close to freezing. Heating already hot water increases its isothermal compressibility and heat capacity and reduces its density, but heating cold water has the opposite effect.

Also, applying pressure reduces the mobility of the molecules in hot water but increases their mobility in cold water. Ice melts when slight pressure is applied, but under high pressure, liquid freezes.

The average electron density around the oxygen atom in a water molecule is about 10 times that around the hydrogen atoms. This nonuniform distribution of positive and negative charges leads to the substance’s unusual behavior. It is called anomalous expansion of water.

Answer 3

Water

Answer 4

Water

Answer 5

Water

Answer 6

Water

Answer 7

Water. Unlike most substances, it expands when frozen (when solidified) as well as when boiled (turned into a gas through heating)

It's why pavements made of concrete have the 'cracks' that you're not meant to step on - it's to allow for the expansion of frozen water.

Answer 8

WATER, yes scientifically speaking water is known to increase in size both when frozen and when heated.

Answer 9

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Answer 10

Water--because the atoms are polarized. Water is at its densest at -4 degrees C.

If water didn't expand as it froze, then all life on earth would end. Can you think of why that would be? Think about ice sinking instead of floating.