Fun Facts. 1  Table tennis has been an Olympic sport since 1988. 2  In professional table-tennis volleys, the ball can reach speeds as high as 90 miles per hour. 3  Table tennis is the national sport of China.  Table tennis is the second most played sport in the world, behind soccer.
The Borg Scale is a method to measure a personâs perceived exertion rate. Developed by Stockholm University professor Gunnar Borg during the 1980s, the scale does not require any equipment, but asks participants who engage in physical activity to assess his or her perceived rate of exertion from light to strenuous. The scale measures exertion in a range between six and 20.
A Comparable Scale to Rockwell Hardness. The Rockwell scale has been compared to the Brinell scale. The Brinell scale was developed by Swedish engineer Johann A. Brinell in 1910. This scale operates as follows. A load is applied to a hardened steel ball that sits on a flat surface of the metal waiting to be evaluated.