Propylene glycol (in humans) is broken down by alcohol dehydrogenase and then aldehyde dehydrogenase into lactate. (Relatively harmless.) The same two enzymes work on ethylene glycol to make glycoald… (View Post)
Sorry, instead of just posting links, I should have summarized: -RV antifreeze (prop glycol) expands slightly when it turns to a slush. The slush period is termed burst protection. -When it freezes, … (View Post)
Here's a link describing the freezing point of mixtures. https://www.chardonlabs.com/closed-loop-systems/glycol/ Here are graphs of density showing contraction of propylene glycol when it freezes (hi… (View Post)
In p-chem class, the instructor put water in a thick metal container and sealed it. He then put that in liquid nitrogen and when the water froze, it broke the container (obviously). I bring this up b… (View Post)
I had an old bike rack laying around for the old Thule "square" bars that can't be used on the new "aero" bars currently on our vehicles (and most other cars). I made a perch so t… (View Post)