For the various sizes of tubing and wall thickness used in a hydraulic system, the inside diameter can be determined if it is remembered that the inside diameter equals the outside diameter less __________.
• Tube geometry: Relationship between outside diameter, wall thickness, and inside diameter • Hydraulic tubing uses two walls, one on each side of the inside diameter • Basic formula for inside diameter (ID) given outside diameter (OD) and wall thickness (t)
• Visualize a cross‑section of the tube and count how many wall thicknesses fit across the diameter from outside edge to outside edge • Ask yourself: when you subtract the walls from the outside diameter, do you remove wall thickness from one side only, or from both sides? • Try writing a simple formula for ID using OD and t, then see which answer choice matches that relationship
• Be clear that outside diameter includes both walls plus the inside diameter • Confirm whether the wall exists on one side or two sides of the inside diameter • Check your formula by imagining a tube with a very thick wall and seeing which answer choice would still make physical sense
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