Re: Liquid Hydrogen Refrigeration

From: Keith Harwood (vitalmis_at_optusnet.com.au)
Date: 03/24/05 

Date: Thu, 24 Mar 2005 18:02:54 +1100

Cray74@gmail.com wrote:

> Henry Spencer wrote:
>> For one thing, the sky is substantially above 3K (more precisely,
> 2.7K).
>> That's the cosmic background temperature, yes, but there are
> foreground
>> objects as well, some of them moderately bright. I don't remember
> what
>> the final total is, but if memory serves, it's noticeably above 3K.
>
> But is it below 20K? :)
>
> Mike Miller, Materials Engineer

IIRC it's about 10K.