Subscribe
Subscribe
MY AMERICAN SCIENTIST
LOG IN! REGISTER!
SEARCH
 
Logo IMG
HOME > PAST ISSUE > COMMENTS

Cracking with Electricity


Comments


Have you tried the experiment under vacuum or with metal powders? I'm thinking that electric charge builds up as the electrically non-conductive grains try to move past each other, keeping them from moving much until the charge buildup is large enough to overcome air permittivity. This would release the charge and allow grain motion. If this picture is correct you should get a smaller voltage measurement in vacuum for non-conductive powder and essentially no measured voltage with the conductive powder under either vacuum or ambient pressure.
posted by Maurizio Di Mauro
September 5, 2012 @ 1:14 AM


Have you tried the experiment under vacuum or with metal powders? I'm thinking that electric charge builds up as the electrically non-conductive grains try to move past each other, keeping them from moving much until the charge buildup is large enough to overcome air permittivity. This would release the charge and allow grain motion. If this picture is correct you should get a smaller voltage measurement in vacuum for non-conductive powder and essentially no measured voltage with the conductive powder under either vacuum or ambient pressure.
posted by Maurizio Di Mauro
September 5, 2012 @ 3:35 PM


I wonder whether an experiment can be done in vacuum.


posted by Tony Cheong
October 9, 2012 @ 10:54 AM

 

Read Past Issues on JSTOR

JSTOR, the online academic archive, contains complete back issues of American Scientist from 1913 (known then as the Sigma Xi Quarterly) through 2005.

The table of contents for each issue is freely available to all users; those with institutional access can read each complete issue.

View the full collection here.


Indexes

Year-end indexes in PDF format:

2006

2007

2008

2009

2010


Subscribe to Free eNewsletters!


Write for American Scientist

Review our submission guidelines.


Subscribe to American Scientist