The outside diameter (OD) of a copper pipe refers to the measurement of the largest part of the pipe that is not inside or outside the actual dimensions of the pipe itself. This can be found by measuring the length of the pipe and dividing it by the radius of the outer circle.

* (what is the outside diameter of 3/4 copper pipe)*

To calculate the OD of a copper pipe, you first need to determine the radius of the outer circle. The formula for calculating the radius of a circle is:

R = (2π * √(d²)) / d

where R is the radius, π is approximately 3.14, and d is the distance from the center of the circle to the edge of the pipe.

Once you have calculated the radius of the outer circle, you can use this value to find the OD of the pipe. To do this, subtract the length of the inner circumference (also known as the ID) from the radius. This will give you the OD of the pipe.

For example, if the ID of a copper pipe is 1 inch, and its OD is 6 inches, then the OD would be:

6 – 1 = 5 inches

* (what is the outside diameter of 3/4 copper pipe)*

So in summary, the OD of a copper pipe is the measurement of the largest part of the pipe that is not inside or outside the actual dimensions of the pipe itself. It is calculated by measuring the length of the pipe and dividing it by the radius of the outer circle, and is often used in plumbing calculations to ensure that pipes fit properly and are installed correctly.