Submit your questions for Ben in the comments section for a Q and A session next week.
Heating zinc oxide with a blow torch causes it to turn from a white powder into a golden yellow. The process reverses when the substance cools back down to room temperature. The heat drives out some oxygen from the ZnO lattice, cause some locations to have a Zinc metal ion. This disruption in the lattice is able to absorb more blue and violet light, causing the overall substance to look yellow.
- I previously worked on Virtual Reality and other hardware at Valve. I currently work at Google[x].
Prior to starting at Valve, I built computer peripherals such as keyboards, mice, and joysticks that were designed to be used inside MRI machines. My company, Mag Design and Engineering, sold these devices directly to researchers at academic institutions who used them to publish scientific papers in peer-reviewed journals.
After work, I spend time on many different types of projects that usually involve circuit design, machining, material selection, and general fabrication/hacking. My favorite place to be is my home workshop.
ben dot krasnow at gmail
Monday, November 10, 2014
Monday, November 3, 2014
A Crookes radiometer is driven by a thermal gas effect, and not "light pressure" as often thought. I demonstrate the radiometer in a vacuum chamber and explain its optimal running pressure.