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.
I had another lady who said she wanted to run to the grocery store to get some coffee to make for me and my guys while we were installing her new kitchen. She said she was just gonna run to the store and asked if we wouldn’t mind keeping an eye out for her one-year-old daughter who was sleeping at the time. We said fine, but she ended up not returning until four hours later. The kid was screaming her head off and we didn’t know what to do. We tried holding her. We didn’t know if she was hungry or what to feed her. She just kept crying.
Plumbers in Australia have licensing requirements that differ from state to state but it is generally accepted a 4-year apprenticeship with a further minimum experience of 2 years (6 years total) and a further curricular requirement as a benchmark for licensing. Licensed plumbers are also expected to maintain minimum relevant training requirements to maintain their plumbing license