Re: 未購買咖啡是否不應該擠壓他呢? - 咖啡討論

By Necoo
at 2017-05-21T00:13
at 2017-05-21T00:13
Table of Contents
: → qoopichu: 我認真的思考了一下氣體方程式PV=nRT然後得到了一個結果 05/20 12:00
: → qoopichu: 當你袋子被排出來的氣體撐到整個袋子都滿的狀態下 05/20 12:02
: → qoopichu: 體積V就是一個固定的最大值,這個值不會再增加 05/20 12:02
: → qoopichu: 所以任何再從豆中排放出的氣體都只會增加壓力P的數值 05/20 12:03
: → qoopichu: 而增加的P會抑制豆子的排氣 05/20 12:03
簡單問兩個問題,為什麼用手壓袋子,袋子的氣體就會跑出來呢?
同時為什麼袋子扁掉了,不會馬上膨回去呢?
想通這兩個問題,根本不會有以上的結論。
是說,壓袋子到底有沒有影響?
我個人是覺得有啦,特別是用袋子膨不膨來判別豆子是否新鮮的人。
只是這個方法真的正確嗎?
還是回到我剛剛問的第一個問題....
--
他們的話在黃昏裡忽前忽後地漂流著, 沒有一點意義,
而有意義的東西卻是不能用言語表達的, 而且你也不能談的
摘自雷馬克的生死存亡的年代
--
: → qoopichu: 當你袋子被排出來的氣體撐到整個袋子都滿的狀態下 05/20 12:02
: → qoopichu: 體積V就是一個固定的最大值,這個值不會再增加 05/20 12:02
: → qoopichu: 所以任何再從豆中排放出的氣體都只會增加壓力P的數值 05/20 12:03
: → qoopichu: 而增加的P會抑制豆子的排氣 05/20 12:03
簡單問兩個問題,為什麼用手壓袋子,袋子的氣體就會跑出來呢?
同時為什麼袋子扁掉了,不會馬上膨回去呢?
想通這兩個問題,根本不會有以上的結論。
是說,壓袋子到底有沒有影響?
我個人是覺得有啦,特別是用袋子膨不膨來判別豆子是否新鮮的人。
只是這個方法真的正確嗎?
還是回到我剛剛問的第一個問題....
--
他們的話在黃昏裡忽前忽後地漂流著, 沒有一點意義,
而有意義的東西卻是不能用言語表達的, 而且你也不能談的
摘自雷馬克的生死存亡的年代
--
Tags:
咖啡
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