Pressure, not muscle: what 1.37 psi of vacuum does to a sealed tin, how to open a stuck shaker in twenty seconds, and the four habits that stop the next jam.

Four measurements decide whether a table bucket holds one bottle: mouth width, height, ice volume and what the lid can actually do.

Measure the opening before the height: how many stems a vase takes, the 1.5 rule, and four mouth sizes with the job each one does.

A drinks station for ten guests on 76 by 38 cm: three zones, 1.5 lb of ice per guest, two glasses each and six timed steps.

A 40 cm display cabinet gives 36 cm of usable shelf. Bottle length, shelf pitch, door swing and the 90 to 195 cm height range, measured.

A 24 cm bucket leaves a 76 cm bar cart tray usable; a 30 cm one does not. Four fit checks: clearance, tray width, full weight and handle room.