Boltzmann's constant defines the relation between absolute temperature and kinetic energy contained in each molecule of an ideal gas. It must be noted that equation relates energy at an individual particle level and temperature (observed at collective or bulk level). The Boltzmann constant, k, is a bridge between macroscopic and microscopic physics. Once you approach Boltzmann constant as a concept to understand, rather than an equation to know, you will see the beauty of physics at work. All it takes for you is to master the core concepts and principles.
Consider the features of waves as they propagate such as reflection, resonance, dispersion and interference. All waves behave the same way, whether they may be the waves of transverse displacement travelling along a stretched string, waves of electric voltage travelling along a transmission line, sound waves travelling through air, waves of electromagnetic field travelling through space or water waves travelling along the surface of ocean.