Talk:Solar System - Misplaced Pages

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Gas, Ice, Rock

The reference about gases, ices and rock was added in some haste during a previous dispute with HarryAlffa, and I can't remember who added it or where he got the information from. If that person could come back and say where he got it I would be very grateful. Serendi ous 11:49, 14 May 2009 (UTC)

I only added information about ices, you added information about rock (which was wrong), and ASHill included gases. Referring to melting points instead of boiling points is unique, therefore highly questionable. To mix both is just plain dumb, it's not self-consistent, I corrected that again recently, but someone reverted it. HarryAlffa (talk) 15:32, 14 May 2009 (UTC)

Under no circumstances this classification can be based on boiling points. This is simply meaningless. Boiling points strongly depend on pressure, while melting points do not. What pressure do you assume, when you talk about boiling points? In the vacuum the liquid phase does not exist at all, so, what are you going to boil? Ruslik (talk) 15:51, 14 May 2009 (UTC)

I've fixed the inconsistency. This issue needs to be resolved somehow. It can't simply be deleted, because the Solar System article, and indeed all Solar System articles, use these terms continuously, precisely because the scientific papers we rely on for sourcing use these terms continuously. It might be that the IAU has no say in this issue, and that these terms are established by geologists. It might also be that there is no established definition for these terms, and we're just going to have to muddle through, like we do with terms like "asteroid" and "other solar systems". Serendi ous 17:16, 14 May 2009 (UTC)

A typical phase diagram. The dotted line gives the anomalous behaviour of water. The green lines mark the freezing point and the blue line the boiling point, showing how they vary with pressure.

Talking about the melting point of H and He just grates. The diagram shows melting point & boiling point varies with pressure. Maybe standard pressure is what Planetary Science Research Discoveries presumes when defining volatiles using boiling point. HarryAlffa (talk) 18:23, 14 May 2009 (UTC)

this astronomy page suggests that the terms "gas" "ice" and "rock" are shorthand for specific compounds. Hydrogen and helium are gas, water and ammonia are ice, and silicates are rock. Serendi ous 22:18, 14 May 2009 (UTC)

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