^{10}Noise power may be calculated using the formula P_{n} = kTB, where P_{n} is the noise power in watts, k is Boltzmann’s
constant (1.38 × 10^{−23} J/K), T is the absolute temperature in Kelvin, and B is the bandwidth of the noise in Hertz. Noise
power usually expressed in units of dBm rather than watts, because typical noise power values for ambient temperatures on
Earth are so incredibly small.