Re: [Phys-l] "Ask Marilyn"

[carmelo@pacific.net.sg]

Quoting John Clement <clement@hal-pc.org>:

> Incidentally just a few searches on her name give you a lot of information
> about her.  Anyone can discover my facts quickly by spending a short time
> looking at the web sites.

Someone asked Marilyn whether hot or cold water freezes faster.  
Marilyn replied that it is logical that the cold water freezes faster  
since it has does not have to cool down as much to hit freezing.

In the latest AJP, it is suggested that one may consistently observe  
hot water freezing faster than cold water under certain conditions.  
"For hot water at an initial temperature of > about 80°C and cold  
water at < about 20°C, the cold water must supercool to a temperature  
of at least about 5.5 °C, lower than the temperature to which hot  
water supercools." Perhaps someone should email this paper to Marilyn  
for comments.


Best regards,
Alphonsus