# A Is the Plank length the same in every direction?

1. Jul 28, 2017

### John Tatum

while i understand what plank length is... Has it ever been measured on multiple axis? As an indicator of the granularity has the plank length (or second) been thus measured?

2. Jul 28, 2017

### phinds

That's like asking is one meter the same on multiple axes. Being a unit of measure, of course it is the same in every direction.

The Plank length is, as I recall, something like 20 ORDERS OF MAGNITUDE smaller than our ability to measure.

3. Aug 7, 2017

### ohwilleke

It appears that you do not understand what Planck's length is, because the Planck length is not something that is "measured". It is a quantity derived by combining several fundamental constants that are measured that dimensionally, when combined, give rise to a sole remaining dimension of length. It is determined without any physical context whatsoever. Specifically, the Planck length is the square root of a quantity equal to the reduced Planck's constant times Newton's constant divided by the speed of light cubed.