Question

HELP PLEASE

while deciding the..... question

please answer refer the attachment.

Answer 1

While deciding the units of heat, we must keep two reference temperatures for ease of calibration. The most common reference points are boiling point (373 K) and freezing point (273 K) of water.

These two temperatures are the most convenient to calculate, as they are accompanied by a visible change in the physical state of the liquid under observation, unlike other liquids.

All substances contract on cooling on expand on heating & water does the same until 4 degrees after this,it expands...when ice is heated St 0 degrees it contract rather than expanding..this property of water support life of aquatic animals & plants. The water is frozen at the surface while water Remains liquid below the layer of ice

Answer 2

Answer:

hey sis u r name is Rujula....