Question

 Why is there a vacuum in a flask?

Answer Because the moisture in the food freezes. Short term, you can prevent this with a tight fitting seal around your frozen package. Long term? There's not a whole lot you can do.
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Top Q&A For: Why is there a vacuum in a flask

Who invented the vacuum flask?

The vacuum flask was invented by Sir James Dewey in 1892. This was a breakthrough because it allowed liquids to be stored and kept warm for an extended period of time.Source:Cryogenic Society of A... Read More »
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Are there any recalls on Kenmore vacuum cleaners because the switch doesn't shut the vacuum cleaner off?

There may or may not be. With a model number, it might be possible to check. Or you could use the toll free number and ask a representative point blank. Make sure you have that model number, a date... Read More »
http://wiki.answers.com/Q/Are_there_any_recalls_on_Kenmore_vacuum_cleaners_because_the_...

What is the minimum vacuum pressure a vacuum pump should have for a vacuum bag repair?

Answer yesThis answer is not correct. Please note accompanying discussion and the associated hyperlink to a science fair study. Dea. Steve Johnson
http://wiki.answers.com/Q/What_is_the_minimum_vacuum_pressure_a_vacuum_pump_should_have...

Is there structure in a vacuum?

IF you are jumping the right set of terminals, then: The solenoid is failing to 'push' the starter (pinion) into place and engaging the flywheel. The solenoid needs to be replaced, although the pin... Read More »
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