/*Berekend de uitlaatcondities bij 
een bepaalde druk en temperatuur*/



function gaslaw(){
         {
		 var Vo = eval(document.forms[0].Vo.value);
		 var Ti = eval(document.forms[0].Ti.value);
		 var To = eval(document.forms[0].To.value);
	     var Pi = eval(document.forms[0].Pi.value);
		 var Po = eval(document.forms[0].Po.value);
         
         if (Vo < 1 || Vo > 50000)
		    { window.alert("Oeps, wrong input:  Vo  " + Vo+"  must be between 1 and 50000 l/s");
			     }
		 if (Ti < -50 || Ti > 200)
		    { window.alert("Oeps, wrong input:  Ti  " + Ti +"  must be between -50 and 200°C");
			     }
		 if (To < -50 || To > 200)
		    { window.alert("Oeps, wrong input:  To  " + To +"  must be between -50 and 200°C");
			     }
		 if (Po < 0.05 || Po > 120) 
	        { window.alert("Oeps, wrong input:  Po  " + Po +"  must be between 0.05 and 120 bar(a)");
				   }
         if (Pi < 1 || Pi > 300) 
	        { window.alert("Oeps, wrong input:  Pi = " + Pi +"  must be between 1 and 300 bar(a)");
			       } 
		 
		 var Vit = Math.round(Vo * ((Ti + 273)/(To + 273))*(Po/Pi)* 100);
		 var Vi = (Vit/100);
                       }
document.forms[0].Vi.value = Vi;	 
	}