A

Why is glass transparent?

6 Answers
You can see through it.
H

It is my understanding that light won't pass through certain (opaque) solids when the energy of the photons of the light source is absorbed by the electrons of the opaque solid.

If the photons are NOT absorbed by the electrons, then the light (photons) passes through the solid making it transparent.

It takes a higher energy photon to excite an electron in glass (and so get absorbed) than it does to excite an electron in other opaque solids. This is why UV light does not pass through ordinary glass. (It gets absorbed by the glass' electrons.)

...
N

The key to understanding this question is to be found in consideration of the element carbon. Carbon exists in solid form as either graphite, which is opaque, and diamond, which is transparent. The difference between the two substances is their chemical structure, the way one carbon atom bonds with another. Since both substances are made from the same material we can deduce that the material has no part in determining whether a substance will be transparent or not. What matters is the way in which the atoms are structured. The lattice structure will vibrate in different modes known as phonons. Some phonons will cause a material to absorb photons of light and turn the energy into heat whilst other phonons will allow them to be absorbed and reemitted. Light rarely passes straight through and only when it is absorbed and reemitted does a material appear transparent.

Glass therefore is transparent because it has a lattice structure that has a vibrational pattern which allows photons to be absorbed and reemitted.

...
A

your answer is the closest to what is understood about condensed matter, although pretty incomplete. Believe it or not, there is a whole theory about the interaction of light with condensed matter (solid state) which is very important in both understanding and predicting the properties of semiconductors deliberately spiked with impurities; i.e., all the components of computer chips.
Nesss80 you seem to be closing in on the concepts but you are not there. Good try.

...
H

Glass is transparent because visible light can pass through it.

When sunlight reflects off an object, say a tree, we can see this tree through our car window. This is because the sunlight reflecting off the tree passes through the transparent glass of the window and then hits our eyes.

...
A

You are saying glass is transparent because it is transparent.

Why is glass transparent and aluminum opaque?

...
A

You are saying glass is transparent because it is transparent.

Why is glass transparent and aluminum opaque?

...