US vs Europe

[too_sleepy]

Hi

A few questions for those in the know.

Millibars for Atmospheric Pressure
Does the US use a different atmpspheric reporting scale to Europe. I though millibars was used everywhere.

Transition Altitude
Switching to "flight-level" at 18,000 feet is an FAA convention; does this procedure vary in European countries or is there a standard in Europe?

Thanks