He could feel the anger 'boiling up' inside him. [=he could feel himself becoming very angry]
The water in the pot is 'boiling over'. = The pot (of water) is 'boiling over'.
The kettle (of water) is 'boiling'. = The water in the kettle is 'boiling'.
(..) - No. "During fractional distillation, hydrocarbons are separated according to their..." Melting point. Ooh, it's boiling points. That's what I meant. Yeah, that's not what you said. - No. - No? Oh, do you need... (..)2016 TvShow: Stranger Things Title: Chapter One: The Vanishing of Will Byers Season: 1 Episode 1