Thickness

These copybooks are the same thickness.

Gauges are used to measure the thickness of wire.

You know of course that a mathematical line, a line of thickness nil, has no real existence.

Clearly, the Time Traveller proceeded, any real body must have extension in four directions: it must have Length, Breadth, Thickness, and Duration.

The thickness of Saturn's rings ranges from 10 to 100 meters and the rings vary in brightness.

A caliper is an instrument for measuring thickness and internal or external diameters inaccessible to a scale or a ruler.

Nor, having only length, breadth, and thickness, can a cube have a real existence.

Filby became pensive. “Clearly,” the Time Traveller proceeded, “any real body must have extension in four directions: it must have Length, Breadth, Thickness, and—Duration. But through a natural infirmity of the flesh, which I will explain to you in a moment, we incline to overlook this fact. There are really four dimensions, three which we call the three planes of Space, and a fourth, Time. There is, however, a tendency to draw an unreal distinction between the former three dimensions and the latter, because it happens that our consciousness moves intermittently in one direction along the latter from the beginning to the end of our lives.”

That Space, as our mathematicians have it, is spoken of as having three dimensions, which one may call Length, Breadth, and Thickness, and is always definable by reference to three planes, each at right angles to the others.

The iPad 2 has around 9 millimeters of thickness.