I looked this up and found this article
http://tinyurl.com/266skj
Heat causes the batter to rise faster. This is a very good transcript from Good Eats about muffins, but it applies to scratch cakes in many ways also - especially the part about over-mixing!
http://www.goodeatsfanpage.com/Season7/Muffin/MuffinTrans.htm
Thanks for the article! Now I know why I was getting giant bubble holes in my cakes when I first started out. I guessed that I was overmixing and I did fix it by mixing less, but it's good to know the science behind it! (And the baking powder bit, too).
I've always used a cold oven. Don't know why, just did. I think I will experiment with a warm oven to see the difference.
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