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Glass is an amorphous solid of indeterminate phase, but leaning strongly towards the solid side of the spectrum. In other words, glass is difficult to class as a solid purely because it does not form a crystal lattice; on the other hand, it has no demonstrable viscosity and does not evaporate, meaning it is clearly not a liquid. It would be proper to place glass in it's own phase between solid and liquid, however if we insist on using the three traditional forms of matter (solid, liquid, gas) then glass can be classified as a solid on the basis of exclusion, as it is clearly neither liquid nor gas. Compare and contrast with pitch, which appears to be a solid but is in actuality a highly viscous fluid.
Radio waves are a form of energy.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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