emission and absorption are types of spectroscopy i use here. continuous spectra, which is what you're talking about, is not what i need, other than needing to know the energy that i'm starting with.
emission spectra come from energy being absorbed by matter and then emitted again by the matter. depending on what the matter is, it can only absorb photons of specific energies, and can emit them only in specific bands of the spectrum. this is why it is also called bright line spectra.

reflection and refraction are not the same thing. neither are the absorption and emission that i am talking about.

aircraft WINGS work by the principle of aerodynamic lift. the thrust needed to move the air over and under the wings at different rates, because of the shape of the wing, to create this lift, comes from the motion, created by the thrust, created by the compression of air by the blades in the propeller or jet engine rotor.

this compression is also what creates the conditions that cause contrails to form

and thus concludes our physics lessons for today. cough and geez all you want. yes, this will all be on the test.

we will cover false equivalence in a future lesson.