The process is a little overwhelming if you consider the fact that you have to take the dashboard apart, but if you just take it a step at a time, it's not that bad. 1. there is a horizontal part of...
The actual protective cover is either made of plastic or glass. The part that is screwed into a socket is aluminum, and the filament wire is made of carbon.
They calculate the temperature of the air and also help calculate the humidity of the air. Using you Earth Science Reference Table you can take the difference of the wet and dry temperatures and then...
The filament has to be protected from the oxygen-rich atmosphere, or it burns up. The bulb keeps the filament in an oxygen-free environment where it can glow w/o being consumed.