But I think this gives a solid and intuitive feeling for what Planck's constant really is.

It just happens more slowly or faster, but the same amount of work is done to lift and lower the boat, regardless of the wave frequency. Category Education; License Creative Commons Attribution license (reuse allowed) Show more Show less. Electrical power can be measured as a product of two frequencies and the Planck constant. In the balance the force is the weight of a mass standard. Planck's constant is the smallest unit of energy multiplied by the time unit (second). The dimension of Planck’s constant is the product of energy multiplied by time, a quantity called action. this one, so there is no evidence for any variation in Planck's constant.I would guess (it's not my area) that any big variation would affect the evolution of the universe and be observable today, so … unit of planck's constant (h) is.

To measure the Planck constant, the researchers used a Kibble balance, a device that suspends a 1-kg weight with electromagnetic forces. Using just five constants in nature (including the speed of light and the gravitational constant), you, me and even aliens from Alpha Centauri could arrive at these same Planck units. Planck's constant relates two different physical quantities. The first observation is that Planck's constant has units, it is not a numerical constant but carries physical dimension. A quick Google will find you no end of papers reporting no variation e.g. I have not seen Planck's constant expressed in terms of the energy of a single wavelength. On the other hand, seeing that energy and frequency aren't the same thing, there is a little more to the equation, and to Planck's constant.

The S.I. ħ = h/2π = 1.054571.10-34 J.S . The small size of h is a result of the units that are used to describe it. It is true that inches = 2.54 * centimeters, which establishes another proportionality constant, but between two units of the same dimension. Its value in metre-kilogram-second units is defined as exactly 6.62607015 × 10 −34 joule second. Therefore the dimensions of Planck's constant are (energy)/(frequency) which means Joules x seconds In fact Planck's constant = 6.67 x 10-34 joule.seconds. In the late 1890s, physicist Max Planck proposed a set of units to simplify the expression of physics laws. The Planck constant is also very often divided by 2π in the equations where it is found, so many scientists use the following constant, ħ (h-bar), to denote the Planck constant divided by 2π.

These have to do with two quantum mechanical effects that are being used to measure voltage and resistance. It is a physical constant. Planck also argued that this system of natural units would always remain the same as long as the law of gravity, which depends entirely on the constant of universal gravitation G, the velocity of light in vacuum c, and the principles of thermodynamics, did not present any kind of variation.

In some sense, this makes all the difference: in your favorite unit system, \$\hbar\$ has the numerical value \$1\$ . Hence, the unit of mass can be linked to the Planck constant." Planck’s constant is often defined, therefore, as the elementary quantum of action.