You whose clothing is warm, when the earth is still by reason of the south wind?

How thy garments are warm, when he quieteth the earth by the south wind?

And you're only getting power from the air that's heating at the same time, but you're wasting all the energy heating the metal and cooling the metal.

If there is a warm layer of air higher up, an inversion can prevent thermals from rising high and the air is said to be stable.

In open cup devices the sample is contained in an open cup which is heated, and at intervals a flame is brought over the surface.

Another, far less common, type of MEMS based accelerometer contains a small heater at the bottom of a very small dome, which heats the air inside the dome to cause it to rise.

What you're seeing when you put it through a prism is that you heat hydrogen up and it doesn't just glow like a white light, it just emits light at particular colors, a red one, a light blue one, some dark blue ones.