Re: Water and watering etc.

Richard Marsden (
Wed, 28 Jun 1995 09:04:20 -0700 (PDT)


> > I hadn't really thought about it, but room temperature (say,
> > 20C), is a bit closer to 0C than 100C! :-)
> Yes, but don't forget that the energy required for H2O to change state
> from liquid to gas is far more than the energy required to heat the
> same amount of liquid from 0C to 100C (if I remember correctly - it's
> been quite a while).

I think you're right - its about 4 years since did A-level chemistry,
but vaporisation & fusion enthalpies were quite a bit greater than
specific-thermal-capacities. Of course, if you're freezing, you have to
deal with the enthalpy of fusion (ie. reverse the effect of melting). I'm
not sure, but I think this is less than vaporisation (boiling).