Hi,

Entropy is the measure of the disorder of a system. It is an extensive property of a thermodynamic system, which means its value changes depending on the amount of matter that is present. In equations,

entropy is usually denoted by the letter S and has units of joules per kelvin (J⋅K⁻¹) or kg⋅m²⋅s⁻²⋅K⁻¹. A highly ordered system has low entropy.

Thanks for asking 

Good day :)