Talk:vacuum

The plural can be vacuums or vacua, but I don't know how to change this.

Is it correct to use vacuum for underpressure just below atmosheric pressure? I have seen it writing but it is far away from the original definition.
 * I wouldn't have thought so. But if you can provide evidence of this actual use, then we would include it in our definition. SemperBlotto 12:27, 30 December 2011 (UTC)