Planck Time

In physics, the Planck time, (tP), is the unit of time in the system of natural units known as Planck units. It is the time required for light to travel, in a vacuum, a distance of 1 Planck length. The unit is named after Max Planck, who was the first to propose it.

The Planck time is defined as:

≈ 5.39106(32) × 10−44 s

where:

is the reduced Planck constant (sometimes is used instead of in the definition)
G = gravitational constant
c = speed of light in a vacuum
s is the SI unit of time, the second.

The two digits between parentheses denote the standard error of the estimated value.

Read more about Planck Time:  Physical Significance

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