水素の40度セルシウス、4MPaにおける密度、音速は？
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水素の40度セルシウス、4MPaにおける密度、音速は？
密度は約0.089程度です！
密度は一般的に0.0899KG/m3として計算され、音速の意味はわかりません。
標準状態では0.089だが、圧力を40キログラムまで上げても0.089のままか？
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