technically ok?

Question

Vacuum (7 mmHg) was applied and heated to 120 °C for 10 h. Dear sir, can u say that the above sentence is technically ok? (especially vacuum applied?)

Mister Micawber · Accepted Answer

Hmm. Vacuums are not really applied, are they? How about induced?

Goodman · Answer

Mister MicawberHmm. Vacuums are not really applied, are they? How about induced?

Well, this is a question perhaps I may be able to answer. Technically speaking, when we speak of vacuum, we are not referring to the vacuum cleaner which is a form of negative pressure which we see as suction. We are talking about negative pressure which must be created by a mechanical vacuum pump for low vaccum (50 milli-tor) and molecular pump for ultra high vac. [< 10^-9 Torr ]. No matter what, true vacuum only exists in outer space and so we make pumps to generate the vacuum we need and then apply it to a process. You may say from that perspective that vacuum is induced. However, when vacuum is used in a process, vacuum is said to be appplied to a chamber (pumped down) for a designed purpose. In semiconductor manufacturing, vacuum is extremely important part of process.

From the posted question, it appeared to be a process which only requires negative process to remove some of the oxygen content from a chamber and then heat is applied. I think it's fine.

Marius Hancu · Answer

Indeed, "vacuum applied to" works.

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... A vacuum gauge and bleed valve assembly allows control and monitoring of vacuum applied to the chamber ...

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AutoZone is America's #1 retailer of auto parts and accessories. ... Hg or less of vacuum applied to the valve, air should blow out of the opposite passage ...

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... against the passage of air, so that the vacuum applied to the trapway can help pull out the ... a flushing, so that a vacuum applied to the trapway 42 will ...

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Vacuum Check Valve. Allows vacuum in only one direction. The symbol indicates the direction of air flow. So vacuum applied to the pointed side of the symbol will pass. Vacuum applied to the flat side will not.

Ant_222 · Answer

Do you apply vacuum to something, or just create it? If you mean that your purpose was just to heat a gas at a low pressure "apply" is not correct.

Goodman · Answer

Ant_222Do you apply vacuum to something, or just create it? If you mean that your purpose was just to heat a gas at a low pressure "apply" is not correct.

We create the vacuum to apply it in a process.

MrPedantic · Answer

I would change the spacing a little:

"Vacuum (7 mm Hg) was applied and heated to 120°C for 10 h." (Or "10 hr".)

(I'm also not quite sure about "applied and heated". Do we say "the vacuum was...heated", in this context; or do we apply the vacuum and then heat the container/specimen/etc.?)

MrP

technically ok?

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