3boys2girls » 化學物理生物 » 幫下我T3T 有無人CHEM勁.解答下E[email protected]@

2009-4-11 11:12 陳SIU文
幫下我T3T 有無人CHEM勁.解答下E[email protected]@

*** 作者被禁止或刪除 內容自動屏蔽 ***

2009-4-12 00:30 __妍`
未教喎 -3-

2009-4-12 17:11 magiyafeimo
俾少少資料你先
如果牛奶過期,會變質,結塊
結塊的話,黏稠度增加
有專門測試黏稠度的機器,用一支攪拌棒係中間轉動,以轉動時遇到既阻力黎知道佢既黏稠度viscocity

2009-4-14 15:05 ZeroYip
我唔係好明個問題
仲有係咩功課?
If you want to test the milk expire or not
you may use the pH paper to test also.
Normaly fresh milk is around 6.4-6.7 pH
and when time pass by @ room temperature
The lactose in the milk is converted to lactic acid
such that the concentration of H3O+ ion increase
as a result the pH decrease.

頁: [1]


Powered by Discuz! Archiver 5.5.0  © 2001-2006 Comsenz Inc.