🦋 The 3 states of H2O - an example of why I like physics.

Do you like physics? Is physics a subject you find difficult?

I like physics because it explains the phenomena we see in life. 

It is a subject that do not require the memorisation of details. Understanding  principles and applying principles  will enable us to answer questions  like what is below.

The molecules in ice, water, and steam  are all H2O.

What makes them different?

Ice has a fixed shape. Until it melts it does nor need any container to keep its shape.

Water will fit itself into the shape of whatever  container it is put into. Why?

Why do water remain in its container and not leave it?

Boiling water in a pressure cooker will increase the pressure  in the pressure  cooker untill a certain  point. After that the pressure remain the same untill the flame or heating source is turned off. Why?

If you take 1 litre of water that is at 4 degrees  Celsius  and slowly increase it temperature the volume will increase. Why?

If you put a jar of water at 4 degrees Celsius in a room that is kept at - 10 degrees  Celsius the water in the jar will eventually freeze.

Does the water at the top of the jar freeze first or the water at bottom  freeze  first or does the water of the whole jar freeze at  roughly the same time? Why is this important  to fishes in a pond during winter?🦋

Unlike a subject like History which requires  the memorisation of details, we do not need to study in order to answer questions  like the above. 

Students who memorise  facts will struggle with such questions.

Students who can apply principles of atomic structure & bonding and the effect of energy on such will be able to answer the questions.