# Planck's Constant Digits

• dav2008

#### dav2008

Gold Member
OK, we all know there's tons of websites that give the digits of Pi and even e...But does anyone know how many digits we know Plancks constant to? Is experimentally the only way to determine it?

Unlike &pi; and e, which are defined mathematically, h and c are experimental numbers so we do not know them to more digits then have been measured. h is sort of self limiting.

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NIST lists the CODATA concise form for Planck's constant as h=6.626 068 76(52) x 10-34 J s.

Hm..Ive seen those parenthesis after constants in my textbook...What do they mean? It says something about like theyre not certain about those digits...is that right?

()=uncertainty or experimental error(?)

Originally posted by Loren Booda
NIST lists the CODATA concise form for Planck's constant as h=6.626 068 76(52) x 10-34 J s.

The (52) is the error in the last digits, so

6.626 068 24 < h < 6.626 069 28

## What is Planck's Constant?

Planck's Constant is a fundamental physical constant that relates the energy of a photon to its frequency. It is denoted by the symbol h and has a value of approximately 6.626 x 10^-34 joule seconds.

## Why are Planck's Constant digits important?

Planck's Constant digits are important because they help us understand the behavior of particles at the atomic and subatomic level. It also plays a crucial role in many areas of physics, such as quantum mechanics and thermodynamics.

## How was Planck's Constant determined?

Planck's Constant was determined through experiments conducted by German physicist Max Planck in the late 19th and early 20th century. He observed the relationship between the energy of a photon and its frequency, leading to the formulation of this constant.

## What is the significance of the digits in Planck's Constant?

The digits in Planck's Constant represent the precision with which it is known. The more digits that are known, the more accurate our understanding of the fundamental nature of the universe becomes.

## Can Planck's Constant digits change?

No, Planck's Constant is considered a fundamental constant of nature and is not expected to change. However, as our measurement tools and techniques improve, we may discover more precise values for this constant.