Oil field operators can use several practical equations for calculating flow rates of natural gas through venturi gas-lift valves. For critical flow, this analysis derived such equations from a ...

For more than a century, schoolbook physics has divided matter into neat categories like solid, liquid, gas, and plasma. A ...

In recent months, I’ve mentioned super-solids a couple of times, which is a bit unusual for something we haven’t been sure actually exists. However, a recent paper seems to offer some quite strong ...