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What (who) is roundness - definition

MEASURE OF HOW CLOSELY THE SHAPE OF AN OBJECT APPROACHES THAT OF A CIRCLE

Cylindricity; Roundness (object); Circularness

$The ISO roundness of square is <math>\frac{1}{\sqrt{2}} \simeq 0.7</math>, while the roundness of octagon is <math>=\frac{\sqrt{2+\sqrt{2}}}{2} \simeq 0.92</math>.$

Roundness

·noun Openess; plainess; boldness; positiveness; as, the roundness of an Assertion.

II. Roundness ·noun Fullness; smoothness of flow; as, the roundness of a period; the roundness of a note; roundness of tone.

III. Roundness ·noun The quality or state of being round in shape; as, the roundness of the globe, of the orb of the sun, of a ball, of a bowl, a column, ·etc.

roundness

n.

1.

Sphericity, circularity, rotundness, rotundity, globosity, globularity, globularness, orbicularness, cylindricity, fulness, plumpness.

2.

Fulness, smoothness of flow.

3.

Openness, plainness, boldness, positiveness.

Roundness

Roundness is the measure of how closely the shape of an object approaches that of a mathematically perfect circle. Roundness applies in two dimensions, such as the cross sectional circles along a cylindrical object such as a shaft or a cylindrical roller for a bearing.

https://en.wikipedia.org/wiki/Roundness

Wikipedia

Roundness

Roundness is the measure of how closely the shape of an object approaches that of a mathematically perfect circle. Roundness applies in two dimensions, such as the cross sectional circles along a cylindrical object such as a shaft or a cylindrical roller for a bearing. In geometric dimensioning and tolerancing, control of a cylinder can also include its fidelity to the longitudinal axis, yielding cylindricity. The analogue of roundness in three dimensions (that is, for spheres) is sphericity.

Roundness is dominated by the shape's gross features rather than the definition of its edges and corners, or the surface roughness of a manufactured object. A smooth ellipse can have low roundness, if its eccentricity is large. Regular polygons increase their roundness with increasing numbers of sides, even though they are still sharp-edged.

In geology and the study of sediments (where three-dimensional particles are most important), roundness is considered to be the measurement of surface roughness and the overall shape is described by sphericity.

https://en.wikipedia.org/wiki/Roundness

Examples of use of roundness

1. "I think it‘s that roundness [of tone]" created by free singing that gives the choir its unique sound, he says.

2. For, it seems, those whose physiognomy retains the roundness, innocence and prepubescent softness of an infant rarely inspire confidence and trust.

3. Next, I angled a big, soft studio light to give a rim of shadow to the root, thereby adding roundness and texture.

4. But there is also a manufactured symmetry, an every–gal‘s–got–issues roundness, an HBO sitcomitude to the movie that undercuts its own observational intelligence.

5. Bayram said that in 2003 he encountered difficulties in calculating the roundness of some shapeless particles and started searching for a new method, which he discovered after intensive research. «Thanks to the new method we are able to calculate roundness more accurately.