The difference between pipes and tubes is simply in the way it is sized. PVC pipe for plumbing applications and galvanized steel pipe for instance, are measured in IPS (iron pipe size). Copper tube, CPVC, PeX and other tubing is measured nominally, which is basically an average diameter. These sizing schemes allow for universal adaptation of transitional fittings. For instance, 1/2" PeX tubing is the same size as 1/2" copper tubing. 1/2" PVC on the other hand is not the same size as 1/2" tubing, and therefore requires either a threaded male or female adapter to connect them. When used in agricultural irrigation, the singular form "pipe" is often used as a plural.
Called in on Wednesday evening to schedule a new sink hookup and was put on the schedule for Friday morning with no problems. Ryan arrived and took a look at what I had, gave some recommendations and provided a couple quotes. He took his time and made sure everything he installed was the most efficient and correct for my setup. We will continue to use and strongly recommend Atomic Plumbing.