Temper's Temperature

There's a connection between anger and heat; where else would these phrases come from?

He lit my fuse.
She's a hot head.
She makes my blood boil.
I was in the heat of passion.
She exploded.
Our tempers flared.
She's like a volcano.
He's red faced.
Stay cool!
Chill out!
He burns me up.
My wroth is kindling.
We had a heated argument.
I'm steamed!
She burns me up!
Don't push his hot button.
I'm fuming!
She's venting!
There are degrees of anger.
Some anger is caustic.
He makes inflammatory remarks.
Don't blow up.
Simmer down!