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Can I ask a really stupid question...

(6 Posts)
ELF1981 Wed 20-Jun-07 20:42:08

I keep seeing the adverts saying that if you wash at 30 not 40 then you can help save the environment... but why is it the temperature rather that the amount of washing done that makes a difference?

MrsBadger Wed 20-Jun-07 20:45:59

energy (either gas or electricity) used to heat the water

TheArmadillo Wed 20-Jun-07 20:46:34

I think cos it saves energy in heating up the water.

I'm sure less washing would make a difference too (have to try and get that through to ds )

ELF1981 Wed 20-Jun-07 20:57:21

LOL. Keep seeing the Ariel advert and wondering - I wonder how much engery it takes to heat that extra 10 degrees?

Katymac Wed 20-Jun-07 20:58:50

33% more?

MrsBadger Wed 20-Jun-07 21:16:34

[racks brain]

doesn't it take 1 calorie to heat 1g of water 1 degree?

(and if the water starts at room temp ie 20ish degrees it'll take twice as much energy to heat it to 40 as to 30)

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