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How fast is 139 inches per second?

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It's about one-thirty-thousandth as fast as a bolt of Lightning
In other words, 139 inches per second is 0.000036 times the speed of a bolt of Lightning, and the speed of a bolt of Lightning is 28,000 times that amount.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 3,800,000 inches per second when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about 0.00000001 times as fast as The Speed of Light
In other words, 139 inches per second is 0.000000011776813945066 times the speed of The Speed of Light, and the speed of The Speed of Light is 84,912,609.18824 times that amount.
(C) (in a vacuum)
The speed of light (and all other electromagnetic radiation) in a perfect vacuum is known as "c" and measures 11,802,852,677.1650 inches per second, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 7,868,568,451.57480 inches per second when passing through the glass of a typical window.
It's about 90,000,000 times as fast as Grass growing
In other words, 139 inches per second is 88,000,000 times the speed of Grass growing, and the speed of Grass growing is 0.000000011 times that amount.
(for Kentucky Bluegrass, Poa pratensis) (a.k.a. Smooth Meadow grass, a.k.a. Common Meadow grass) (Summer months, ideal growing conditions)
Kentucky Bluegrass, one of the most common grasses in North America, grows about 0.00000170 inches per second in the summer months under ideal conditions. When left un-mowed, Kentucky Bluegrass grows to heights of 60 to 90 cm (2 to 3 ft) and blossoms with a blue flower.