Biology Notes: Water and its properties: Density and heat fusion

////Biology Notes: Water and its properties: Density and heat fusion

Biology Notes: Water and its properties: Density and heat fusion

ZIMSEC O Level Biology Notes:Properties and Biological significance of water

Property: High heat of fusion

  • This is a measure of the heat energy required to melt a solid (ice).
  • Liquid water must lose a large amount of heat energy to freeze.

Biological role

  • Contents of cells and their environment are therefore less likely to freeze.
  • This is an advantage for bodies of living organisms and organisms that live in water.

Property: Density and freezing

  • The density of water decreases below 4°C and ice tends to form on top and floats.
  • Since ice floats, it forms at the top first and at the bottom last.

Biological role

  • Ice insulates the water below it, thus increasing the chances of survival of organisms in water.
  • It also helps maintain circulation in large bodies of water (water expands and rises at 4°C).

To access more topics go to the O Level Biology Notes page

By |2018-03-03T10:22:45+00:00March 30th, 2017|Notes, O Level Biology Notes, Ordinary Level Notes|Comments Off on Biology Notes: Water and its properties: Density and heat fusion

About the Author:

She holds a Bachelor of Science Honors in Applied Biology and Biochemistry from National University of Science and Technology, a Certificate in Good Clinical Practices from National Institute on Drug Abuse Clinical Trials Network, a Certificate in Leadership from Deloitte and Certificate in Chemistry Laboratory Experiments from Helsinki Metropolian University of Applied Sciences, Finland.
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