 
 <prompt> Abeg translate the text wey dey up there go Nigerian pidgin. If e get programming code inside am, just leave am as e be. No add any extra statement for your response. <response>: Classical statistical mechanics need h to dey exist (but e no define im value). Later on, based on top Planck discovery, dem come sabi say physical action no fit just get any value. Instead, e must be some kind small quantity wey dey multiply, wey dem dey call "quantum of action", wey dem dey call Planck constant now. Classical physics no fit explain dis fact. For many cases, like for monochromatic light or for atoms, dis quantum of action also mean say only certain energy levels fit dey allowed, and values wey dey in between dey forbidden. 