ความคิดเห็นที่ 26
ได้
น้ำบริสุทธิ์ อุณหภูมิต่ำกว่า 0 องศาได้
Select a small, clean drinking water bottle. Drill its cap so as to allow insertion of a thermometer. Seal the thermometer at the cap with a suitable sealant -- silicone, perhaps. Fill the bottle with distilled water. Screw on the cap and allow the water to stand undisturbed for a day. Without shaking the bottle, place it on a freezer so you can see the freezing zone of the thermometer. Allow the bottle to stand in the freezer
for several hours. Check it from time to time -- do not move the bottle or agitate it in any way.
If all goes well, the water will cool to below its freezing point (32 F, 0 C) as evidenced by the thermometer reading of (perhaps) -2 C. The water inside the bottle has supercooled.
จากคุณ :
แมวเหมียวพุงป่อง  
- [
17 ส.ค. 50 08:13:42
]
|
|
|
