Hydrogen specific frequencies of light are absorbed and the light after the hydrogen has dark lines at those frequencies.
becomes more converging
A rainbow
The light will bend as it passes through.
the light bends
Its speed and wavelength change.
Water is dissociated in hydrogen and oxygen.
Set up properly, you will create electrolysis. Oxygen and hydrogen will disassociate form each other and be turned into gases.
what happens to interstellear gas as it passes through a spiral density wave
the food passes through
sh@@ happens
nothing happens
Most of it...absolutely nothing. However the specific frequencies of light that Hydrogen interacts with will have chances of being absorbed and scattered, creating a gap in the light spectra.
becomes more converging
When food passes through the colon, water is absorbed to transform the food waste into feces.
it goes to your stomach
it refracts
It is redirected as it passes through a medium.