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: Different [[substance]]s have a different [[force]] of [[attraction]] between the [[adjacent]] [[particle]]s.
: Silicon dioxide (sand and glass) is [[solid]] at [[Room Temperature|room temperature]] because there is a strong [[force]] of [[attraction]] between [[adjacent]] [[molecule]]s.
: [[Water]] is a [[liquid]] at [[Room Temperature|room temperature]] because the [[force]] of [[attraction]] is not great enough to hold the [[molecule]]s in position. However, it is great enough to keep them together. : [[Oxygen]] is a gas at [[Room Temperature|room temperature]] because there is a very weak [[force]] of [[attraction]] between [[adjacent]] [[molecule]]s.