I wonder what compounds are usually called "ice" and what properties do determine it?
I can bring some examples of ice and not.
Not ice:
- $\ce{H2S}$
- cellulose
- sugar
- graphite
- lithium
- solid mercury
- polyvinylchloride
- solid fats
- ...
Known as ices:
- solid water
- solid $\ce{CO2}$
- solid nitrogen
- solid oxygen
- solid methane (?)
- solid ethanol (?)
It seems they all have some common properties:
- Melting point below room temperature
- Transparency
- White or blueish color
- Chystalline structure (?)
- Easy sublimation and high saturation pressure
- Low strength and other mechanic properties
- Low surface friction (?)
Have I missed anything? What is the accepted definition of ices, say in astronomy or chemistry?