The Kilogram and Planck's Constant

The new kilogram is defined based on Planck’s constan. It can be understood as the mass difference of the number of cesium-133 atoms in the ground state versus the same number in the excited hyperfine state. Or, or as the mass of the number of photons at the Cesium-133 hyperfine frequency trapped in a microwave cavity.

What is a Perm?

A perm is a unit of permeance or “water vapor transmission” given differences in partial pressures on two sides of a membrane or material. It is commonly used in building science as a measure of how much water vapor can pass through a material.

Newton's Law of Gravitation

What is the gravitational force in Newtons between the Earth and the Moon? Write the calculation in Java, C# and Python using the respective Caliper libraries.

JSR 363 Units of Measure

JSR 363 “proposes to establish safe and useful methods for modeling physical quantities”. Caliper shares many of the underlying aspects of JSR 363. Caliper however does not use Java generics, and there is only one system of units. Caliper performs math using double amounts whereas JSR 363 uses Numbers.