Register to reply

Why when water is heated it's volume first decreases and then

by mia5
Tags: decreases, heated, volume, water
Share this thread:
May12-13, 08:57 PM
P: 17
Why is that when water is heated it's volume first decreases and then increases ?
Phys.Org News Partner Chemistry news on
Faster, cheaper tests for sickle cell disease
Simulations for better transparent oxide layers
Characterizing strontium ruthenate crystals for electrochemical applications
May12-13, 09:09 PM
P: 3,002
the theory goes that water as ice the molecules are more widely separated and then as the crystal shape is destroyed by the added heat the water becomes liquid and takes up less space and then when its hot enough it will transition to steam taking up a lot more space.

Wikipedia describes it better:

An unusual property of ice frozen at atmospheric pressure is that the solid is approximately 8.3% less dense than liquid water. The density of ice is 0.9167 g/cm3 at 0 C,[2] whereas water has a density of 0.9998 g/cm at the same temperature. Liquid water is densest, essentially 1.00 g/cm, at 4 C and becomes less dense as the water molecules begin to form the hexagonal crystals[3] of ice as the freezing point is reached. This is due to hydrogen bonding dominating the intermolecular forces, which results in a packing of molecules less compact in the solid. Density of ice increases slightly with decreasing temperature and has a value of 0.9340 g/cm at −180 C (93 K).[4]

refer to:
May13-13, 10:07 AM
P: 17
Thanks for the answer :)

Register to reply

Related Discussions
Why does temperature increase when volume decreases? (Kinetic theory explanations) General Physics 23
Work done on a gas as volume decreases Introductory Physics Homework 1
Expansion of liquefied air to what volume when heated to 20 degrees C General Physics 4
Could water become explosive if heated enough? Chemistry 10
Why does water volume increase when heated? Biology, Chemistry & Other Homework 3