Question

What is the $k$ in physics?

Answer 1

1. The letter $k$ is generally used to denote a constant value. Some of the most commonly used constants denoted by $k$ are:
2. Boltzmann constant, which has a value of $1.38\times {10}^{-23}{\mathrm{m}}^2\mathrm{kg}·{\mathrm{s}}^{-2}{\mathrm{K}}^{-1}$.
3. Coulomb's constant, which has a value of $9\times {10}^9\mathrm{N}·{\mathrm{m}}^2{\mathrm{C}}^{-2}$.
4. Spring constant, whose value depends on the material and overall structure of the respective spring, and it has units $N^{}{m}^{-1}$