What does b mean in this context?

1. Nov 28, 2007

LTP

What does b mean in this context?

$$\Delta S = \frac{h\cdot f}{T} = k\cdot b$$
where S is entropy, h is Planck's constant, f is frequency, T is temperatur and k is Boltzmann's constant.

2. Nov 28, 2007

stewartcs

3. Nov 29, 2007