Diagrams are used to show the relationships between several objects or to portray the function of an object. Diagrams are similar to illustrations in that they are often pictorial representations of an object, but they are often more abstract than illustrations. For instance, the elements that make up a diagram may not be drawn to scale with respect to each other; rather than give an accurate picture of the appearance of an object, the goal of a diagram is to help the reader understand how the elements in the diagram are connected.
Figure 14 is an abstract, pictorial diagram visualizing a transfer line setup connecting a holding tank to a tank car.
Figure 15 is a pictorial representation of an experimental design for a coolable nozzle, showing the interrelationships of parts.
To use diagrams effectively, follow these guidelines: