How to work out vacuum in in.hg

Thread starter deathlucky
Start date Apr 7, 2009
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Vacuum Work

In summary, to convert vacuum from PSI to in.Hg, divide the PSI value by 14.7 and multiply by 30. In.Hg is a unit of measurement commonly used in vacuum systems and represents the height of a mercury column. To measure vacuum using a gauge, connect it to the system and observe the reading. Absolute vacuum is measured relative to a perfect vacuum while gauge vacuum is measured relative to atmospheric pressure. Temperature can affect vacuum measurements by increasing the pressure of the gas or vapor being measured. It is important to consider and control for temperature when measuring vacuum in in.Hg.

Apr 7, 2009

deathlucky

im just wondering to work out vacuum in in.hg say if i have 3 1 letter bottles they have vacuums of 10 in.hg 20 in.hg 30 in.hg how much air will be in the bottles

cheers

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Apr 7, 2009

russ_watters

Mentor

Just ratio the densities to the density at atmospheric pressure.

Apr 7, 2009

deathlucky

ok but what is the ratio

Apr 7, 2009

mgb_phys

Science Advisor

Homework Helper

Atmospheric pressure at sea level is around 30 inches of mercury

Related to How to work out vacuum in in.hg

1. How do I convert vacuum in PSI to in.Hg?

To convert vacuum from PSI to in.Hg, you can use the following formula: vacuum in in.Hg = (PSI / 14.7) x 30. The first step is to divide the PSI value by 14.7, which is the standard atmospheric pressure. Then, multiply the result by 30 to get the equivalent vacuum value in in.Hg.

2. What is the significance of in.Hg in vacuum measurements?

In.Hg stands for inches of mercury, which is a unit of measurement commonly used in vacuum systems. It represents the height of a mercury column in a barometer at a particular pressure. In.Hg is often used to measure the level of vacuum in a system, with a higher value indicating a stronger vacuum.

3. How do I measure vacuum in in.Hg using a vacuum gauge?

To measure vacuum in in.Hg using a vacuum gauge, you first need to connect the gauge to the vacuum system. Make sure that the gauge is properly calibrated and that the scale is set to in.Hg. Then, observe the reading on the gauge, which will indicate the level of vacuum in the system in in.Hg.

4. What is the difference between absolute and gauge vacuum in in.Hg?

Absolute vacuum in in.Hg is measured relative to a perfect vacuum, which is considered to have an absolute pressure of 0 in.Hg. On the other hand, gauge vacuum in in.Hg is measured relative to atmospheric pressure, which is typically 29.92 in.Hg. This means that absolute vacuum can have negative values, while gauge vacuum will always be a positive value.

5. How does temperature affect vacuum measurements in in.Hg?

Temperature can affect vacuum measurements in in.Hg because it can impact the pressure of the gas or vapor being measured. As temperature increases, the molecules in the gas or vapor will have more energy and will exert more pressure, resulting in a higher vacuum reading in in.Hg. Therefore, it is important to consider and control for temperature when measuring vacuum in in.Hg.