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, you don't. A volumetric flask is for general mixing and titration. You wouldn't apply heat to a volumetric flask. That's what a boiling flask is for. Did you not learn nothing from my chemistry class? No. You flunked me, remember? - No wonder. - Prick. (..)2008 TvShow: Breaking Bad Title: Pilot Season: 1 Episode 1
(..) millilitres. Very rare. You got your usual paraphernalia, Griffin beakers... ...there's your Erlenmeyer flask. But the ...a round bottom boiling flask, millilitres. I cook in one of those. A big one. One of these? No, this is an volumetric flask. You wouldn't cook in one of these. (..)2008 TvShow: Breaking Bad Title: Pilot Season: 1 Episode 1