Fairbairn's studies had already showed the importance of tube diameter and how small diameter tubes could easily withstand far higher pressures than large diameters.

But within its ten-foot diameter tubes it was a juggernaut, ferocious and irresistable.

Typically, smaller diameter tubes require more paths of shorter lengths.

Also, the refrigerant charge of the 5-mm diameter tubes was less than the 7-mm diameter tubes.

Therefore, refrigerant pressure drop factors due to small diameter tubes can be offset.

Smaller diameter tubes require more energy to move the air and have less earth contact surface area.

A capillary is a small blood vessel or any small diameter tube.

Mickey Thompson used a large diameter tube as a backbone for one of his Indy cars.

The capillary rise of water in a small diameter tube is this same physical process.

Michelson redesigned Fizeau's apparatus with larger diameter tubes and a large reservoir providing three minutes of steady water flow.