Mark_R....my teaching assignment for a little over 30 years was primarily a 9th grade intro chem and physics class...
OK, that explains it... I remember 9th grade chemistry and physics. 9th grade metal shop had the same thing: "hot metal" meant "I'm coming through with a 900F piece of steel, get out of the way NOW!". Ironically, it was the dumb stuff, like reaching in front of an oxyacetelane torch that tended to get the kids. Nobody every got burned from moving glowing steel.