...

Time to talk numbers (sorry)

Units Used with Pressure

• • • • we use torr to describe the pressure of our vacuum systems

image of vacuum guage used here at SLAC

• • • • we use psi (pounds per square inch) to describe the pressure of our compressed systems

compressed: air, nitrogen, helium, argon, etc...

• • • • we use liters per second (l/s) to describe the rate of gas flowing through something

Log Scales (making numbers lie)

...

The log scale I'm talking about... It's totally math. sorrySorry.

Log scale allows people to create graphs that show tiny things next to giant things really well by stretching out the distance between tiny numbers, and compressing the distance between huge numbers. The powers of 10 does this really well. 

...

Common units that use log scales: sound (decibels: dB), earthquakes (Richter magnitude)

UHV: how

...

few molecules

Ultra-High Vacuum (UHV) is an official term for really really fancy vacuum of a certain (extremely low) range of pressures. And it's the type of vacuum we care about the most. 

...