The Straight Dope

Go Back   Straight Dope Message Board > Main > General Questions

Reply
 
Thread Tools Display Modes
  #1  
Old 07-27-2001, 12:47 PM
McMurphy McMurphy is offline
Guest
 
Join Date: Nov 2000
If I had a 10lb solid block of dry ice stored in deep freeze and I took it out and placed it in a room at normal room temperature, how long would it take to melt?

Also, is it possible to freeze things inside a block of dry ice as it is with normal ice (think David Blaine & his iceman trick)?
Reply With Quote
Advertisements  
  #2  
Old 07-27-2001, 12:56 PM
Fish42 Fish42 is offline
Guest
 
Join Date: Jun 2001
I'll admit this is nitpicking, but...

At room temperature & atmospheric pressure, dry ice doesn't melt; it sublimates (changes from solid directly to a gas without going through a liquid phase).
Reply With Quote
  #3  
Old 07-27-2001, 12:58 PM
Chas.E Chas.E is offline
Guest
 
Join Date: Jun 2000
Nitpick: Dry ice doesn't "melt," it sublimes. It turns directly from solid to gas, which isn't really considered melting. Dry ice evaporates rather than melts.
I have a dry-ice sublimation calculating slide rule that I got from my grandfather, it was used in the olden days when rail cars were packed with dry ice to keep them cool. I'll go dig it up and see what I can figure out about your query.
Reply With Quote
  #4  
Old 07-27-2001, 01:42 PM
Squink Squink is online now
Guest
 
Join Date: Oct 2000
A ~2X10X10" block will take several hours to sublimate at room temp. If it's humid out the block will pull moisture from the air and give itself a bit of insulation.
Reply With Quote
Reply



Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 03:00 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.

Send questions for Cecil Adams to: cecil@chicagoreader.com

Send comments about this website to: webmaster@straightdope.com

Terms of Use / Privacy Policy

Advertise on the Straight Dope!
(Your direct line to thousands of the smartest, hippest people on the planet, plus a few total dipsticks.)

Publishers - interested in subscribing to the Straight Dope?
Write to: sdsubscriptions@chicagoreader.com.

Copyright 2013 Sun-Times Media, LLC.