What Creates a Stronger Vacuum: 15inHG or 10inHG?

[Ruffian]

Im just wondering, is a higher or lower reading of a number in inHG units indicating a stronger or weaker vacuum?

For Example:
What is creating a stronger vacuum?
15inHG or 10inHG

Thanx,

 

[Doc Al]

Often vacuums are measured in inHG (aka: inches of mercury) below atomospheric pressure (as a gauge pressure). Thus 15 inHG would be a stronger vacuum than 10 inHG.

But inHG can also used as a direct measure of pressure (conventional or absolute pressure), in which case: the lower the pressure, the stronger the vacuum.

 

[haiha]

We often use the unit mTorr to indicate vacumm. 1 Torr equals 1mmHg. So the vacuum reaches 76mTorr means the pressure is 10e-4 times smaller than the ambient pressure. Higher vacuum (lower pressure) can be measured in 10^-5 - 10^-7 Torr.