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Quality answers to common physics questions
May25-09 10:31 AM ZapperZ 

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General Physics

- Nature and properties of matter and energy. For any physics topics not applicable to the categories below.
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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 63,618
The aim of this thread is to highlight recent (as in within the past 3 months) noteworthy physics papers that have...
Apr8-14 10:13 AM
ZapperZ
166 160,184
Hi! I would like to ask for some help regarding a project I am thinking of making. Well, the thing is, I would like to...
Feb26-09 06:11 AM
rcgldr
4 5,886
www.spiritofmaat.com/archive/feb2/bearden.htm has anyone read this? skip the fist part if you wish, its the second...
Jun8-03 02:26 AM
vlamir
5 1,489
russian physicists say they have developed a device that create something like 5x the energy that is inputted into....
Mar26-04 06:42 PM
munky99999
0 1,071
If the vacuum was made of stable particles with rest mass (stable in the sense that the particles never decay or in...
Jul7-04 04:35 PM
kurious
0 1,085
Is vacuum energy the lowest energy state?
Sep26-11 12:57 AM
GarryS
0 702
Has it been proven to exist, and if it has, has anyone succeeded in conerting it into another energy such as...
Jun18-10 09:10 AM
K^2
4 1,154
Hi everyone! I need help about understanding the Vacuum process, where can I find some information about it? and...
Jan24-05 09:56 AM
vmedina21
4 2,385
I understand that vacuum fluctuations can spring into and out of existence within a sufficiently short period of...
Jul20-08 05:00 AM
Chalky
0 677
For those who replied to my questions on the Atomic radii of Isotopes and those who claim the vacuum force is...
Jul11-03 10:44 AM
elas
0 1,765
What is the force associated with a vacuum? If I put a straw in a soda and pinch off the end of the straw, then lift...
Feb10-14 11:30 AM
oneamp
2 438
I have added a new page to http://elasticity2.tripod.com/ titled Vacuum and Radii .Scroll down home page to title....
Jul31-03 09:48 AM
elas
2 4,589
Hi Everybody am using chemical vapour deposition unit for coating silver thin films. The pirani gauge is not...
Dec5-10 04:33 AM
cragar
1 957
i have searched the web over looking for some kind of chart for hydrous pyrolysis. im not extremly smart but i grasp...
Feb5-11 07:32 AM
Fish4Fun
8 2,026
What is Vacuum Impedance? In electronics, I would assume that it means some ohmic resistence to alternating EM...
Jul31-03 02:52 PM
wimms
10 2,120
If you have a five gallon jug of water with a 1/2 inch spout, and it is laid on its side, because there is no other...
Aug30-05 07:46 PM
LocktnLoaded
4 1,012
2 questions. 1. why vacuum is not used in hydro electric power plants and 2. why water under presure from big depths...
Jun1-11 12:19 PM
berkeman
5 1,445
I would like to know if there is a formula or a way to determine the amount of insulation a vacuum of 1 bar can...
Sep21-11 05:18 AM
f95toli
3 1,101
Is it possible for electricity to jump a vacuum gap? If so, what is it called when that happens?
Sep5-10 05:24 PM
Bob S
3 931
I'm working on a project with several others to create a flying device much like a blimp, but smaller and more agile....
May19-08 09:57 AM
DaveC426913
4 1,898
There is a common free fall demonstration that involves a long evacuated cylinder, a coin, and a feather. The tube is...
Sep4-12 08:50 AM
M Quack
1 549
OK key equation now is <3|(D - W/\|R> = <&3|R> But <&3|R> is a flux surface integral. Since B =...
Oct12-06 04:15 AM
Jack Sarfatti
0 784
In a hypothetical situation. If I have a vacuum oven that has an internal volume of say 2 gallons. And I want to...
Feb14-11 11:35 AM
yaganon
0 542
I got the following for the units of Vacuum permeability: Hm−1 A2s-2kgm TmA-1 NA−2 VsA-1m-1 ...
Oct4-12 12:28 PM
nasu
3 987
I would like some clarity on a problem I think is attributed to a vacuum space. This is what happened...I have a small...
Jan20-10 01:42 PM
0xDEADBEEF
6 1,218
Could the vacuum ever be polarized to become a dielectric? Has this ever been done?...
Jun26-12 07:29 AM
sankalpmittal
1 569
If I have a vacuum chamber and then poke a 1" diameter hole into it, how would I figure out the flow rate of air that...
Sep15-11 03:10 PM
Great Smoky
0 882
Need to find out how much force would it take to pull up 650 gallons of water into a tank from the bottom by sucking...
Feb20-13 08:41 AM
russ_watters
5 866
Hi, I am in experimental physics and having some problems with a question about vacuum technology. They want you to...
Sep23-08 04:24 AM
Torricelli
1 4,858
Air weighs about 800 times less than water, 1 litre of water weighs 1000 gms approx. while 1 litre of air weighs 1.25...
Sep5-11 08:33 AM
sophiecentaur
31 5,713
hi to all, i have been trying to find some similar project solution on the internet but so far have found nothing, so...
Sep9-12 03:54 PM
mrspeedybob
7 907
Can any dry pump be reused for evacuating a chamber? Ie: I have a 2hp compressor, can I use it to make a vacuum...
Nov16-10 07:31 PM
Dr Lots-o'watts
3 1,238
This is my first post here so hello to anybody who reads this! I just finished calculus based physics II this...
Dec19-07 07:30 PM
QuasarBT
4 1,285
If you were to destroy all the air around an object, would that give you a temporary vacuum or would the air be...
Nov27-09 04:21 AM
dizam
5 872
why doesn't the vacuum of space shred the atmosphere and the planets? only thing i can think of is gravity, but it is...
Apr10-10 07:10 AM
sensor7
0 627
Hi this is probably very easy for you guys, but I can't figure this out. Heated air rises right? Then why is it that...
Jan6-12 08:48 AM
Storm8
6 1,225
Try to picture this. When moving through space (i mean any space, not necessarily outer space) , does one create...
Jan31-12 12:08 PM
wilha
8 1,171
Hi, I am looking for a vacuum sealants for 300-700 degree C, Would someone recommend to me a good solution?
May4-07 05:00 AM
4 1,429
Hi to you all, May I just say I am not a physicist or the like so my questions may seem a bit green to you all, I...
Jun19-08 08:30 PM
pantaz
3 1,634
hi to all, this one may sound silly but i just can't seem to understand how it will work out. this is the setup - in...
Sep11-12 11:02 AM
alibaba2
4 754
In another thread there have been some interest in the Casimir Effect-Vacuum Force-Surface Tension. In the old...
Jul8-03 04:05 AM
ranyart
0 2,816

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