function PhysikCalc(){
var Result;
kb = 1.3806504 * Math.pow(10,-23);
c = 299792458;
h = (6.62606896 * Math.pow(10,-34)) / 2 * Math.PI;
G = 6.67428 * Math.pow(10,-11);
A = eval(document.bhentrop.vala.value);

if(A > 0){

	Result = FormatNumber((A * kb * Math.pow(c,3)) / (4 * h * G));
	
	document.getElementById("result").innerHTML = "Formule : A.k.c<sup>3</sup> / 4.h.G<br />Résultat<br>S=" + Result;
}

}