Why does my battery shorten when out the house?

Hey everyone,
This has been bugging me for a while, so thanks in advance for any help that anyone can give. It's concerning a 13" MacBook Pro, new in April this year.
Basically, whilst I'm in the house (not plugged into the mains, on battery), I can expect 5-7 hours on battery. This would be with Safari, Mail, iCal and Twitter open, and connected to the internet via Wifi.
But, whenever I am out the house (normally at college), and only have one or two apps open (normally Pages as I'd be writing an essay etc) the battery only lasts two hours, Max.
Anyone have any ideas about why this would happen? Or what I can do to find out more?
Thanks again!

I gave your idea a go, and you were bang on! The process was 'Google Chrome helper' and it was using SO MUCH CPU power that I saw the number peak at 100% - something I'm pretty sure shouldn't be possible.
But when I tried to quit the process, it closed, but another one opened up within seconds. I could not get rid of it.
I googled the problem, and it turned out to be a setting - under preferances, the one about anti phishing. I disabled that, and job's a good'n.
Thanks once more!

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