Today I planned to visit the newly opened “The Village Workshop” in Northville, MI for 3D printing some parts. It is really awesome facility to have in the neighborhood for every maker.
While waiting for 3D printing assistance at the entrance, I bumped into a demonstration by Willie from Kold Ice Cream. Both me and my daughter were stunned to see fumes of liquid nitrogen on the table.
Willie was dropping liquid nitrogen on the hands, serving snacks dipped in it which was more fun to see exhaling cold fumes. He offered us a neat explanation behind cold nitrogen boiling at room temperature with boiling point of -196 deg C and turning into vapors. Though it is dangerous to leave your fingers for longer period in the liquid nitrogen, Willie seems fine dropping liquid nitrogen on hands and his shirt.
He showed me and my daughter some cool stuff, like starting fire and then extinguishing with nitrogen fumes and liquid. Too much liquid nitrogen around the flame stops it due to lack of oxygen nearby.
Most important part for my daughter was the liquid nitrogen ice cream preparation. It turned out that it was best ice-cream she ever tasted.
Delicious science study was really cool for all the kids visiting the workshop today. I hope it attracts them to creative developments in STEM field.