Nominal size

Nominal size is a way of describing how big or small something is. It's kind of like saying how tall you are or how big your toy is. When we talk about nominal size, we're usually referring to things that come in standard sizes or measurements. For example, a can of soup might be labeled as "10 ounces" or "300 milliliters" to tell you how much soup is inside. The nominal size is simply the label given to that item based on the standard measurement system.

But here's the tricky thing: even though we call it the "nominal size," it might not actually be the exact size. Let's say you have a piece of wood that's labeled as being 2 inches wide. In reality, though, it might measure slightly more or less than 2 inches because of things like how it was cut, how old it is, or how it was stored. So, while the nominal size is useful for giving us a general idea of how big or small something is, we still need to measure it ourselves to know the actual size.