Reply to thread

Message

<blockquote data-quote="Andy W" data-source="post: 774584" data-attributes="member: 44106">I asked my son about this since he worked in icing research:I saw this rarely when working with ice in a vacuum at work trying to make samples. When water freezes, it expands. When you stick a warm cup of water in the freezer, it freezes from the outside in. Same thing for water in an ice cube tray. Since it forms a shell and then continues to freeze, it creates quite a lot of pressure inside the ice. The outer layers typically stay clear; they're formed at low pressure and dissolved gasses don't build up there. The inside gets cloudy as gasses are pushed out. Anyways, as the pressure builds, it can help create a hole at the surface and form a straw. As the water comes out, it freezes and lengthens the straw, and you can get a long spike.See this Wikipedia article (they're saying a hole is left at the top in the freezing process, which sounds plausible to me): <a href="https://en.wikipedia.org/wiki/Ice_spike" target="_blank">https://en.wikipedia.org/wiki/Ice_spike</a></blockquote>

[QUOTE="Andy W, post: 774584, member: 44106"] I asked my son about this since he worked in icing research: I saw this rarely when working with ice in a vacuum at work trying to make samples. When water freezes, it expands. When you stick a warm cup of water in the freezer, it freezes from the outside in. Same thing for water in an ice cube tray. Since it forms a shell and then continues to freeze, it creates quite a lot of pressure inside the ice. The outer layers typically stay clear; they're formed at low pressure and dissolved gasses don't build up there. The inside gets cloudy as gasses are pushed out. Anyways, as the pressure builds, it can help create a hole at the surface and form a straw. As the water comes out, it freezes and lengthens the straw, and you can get a long spike. See this Wikipedia article (they're saying a hole is left at the top in the freezing process, which sounds plausible to me): [URL]https://en.wikipedia.org/wiki/Ice_spike[/URL] [/QUOTE]

Verification