Chemical scheme calculator This code implements an algorithm for calculation of chemical schemes. This code looks strange but now I have no idea how to refactor it. Can you give your feedback? 

eps=0.001;

s1=new Source(1000,0.17);
mx=new Mixer(1000);
mb=new Mem(0.15,0.95);
sp=new Splitter(0.80);
s2=new Sink();
s3=new Sink();

mx.in1=s1.out1;
mx.in2=sp.out2;
mb.in1=mx.out1;
sp.in1=mb.out2;
s3.in1=sp.out1;
s2.in1=mb.out1;

for (i=0;i&lt;50;i++){
    mx.calc();
    mb.calc();
    sp.calc();
}

function Stream(v,c){
    this.v=v||null;
    this.c=c||null;
    this.selfCheck=false;
    this.Show=function(){//how to add default values?
        return "volume="+this.v+",conc="+this.c+",selfCheck:"+this.selfCheck+"; ";
    }
}

function Source(v,c){
    this.out1=new Stream(v,c);
    this.calc=function(){};
}
function Sink(){
    this.in1=null;
    this.calc=function(){};
}

function Mixer(fixedV){
    this.fv=fixedV;
    this.in1=null;
    this.in2=null;
    this.out1=new Stream();
    this.calc=function(){
        this.out1.v=this.fv;//||this.in1.v+this.in2.v;
        this.in2.v=this.in2.v||0;
        this.in2.c=this.in2.c||0;
        this.in1.v=this.out1.v-this.in2.v;
        this.out1.c =(this.in1.v*this.in1.c+this.in2.v*this.in2.c)/this.out1.v;
        this.out1.selfCheck=Math.abs
        ((this.in1.v*this.in1.c+this.in2.v*this.in2.c)-(this.out1.v*this.out1.c))&lt;eps;
    }
}

function Splitter(kS){
    this.in1=null;
    this.ks=kS||0.05;
    this.out1=new Stream();
    this.out2=new Stream();
    this.calc=function(){
        this.out1.v=this.in1.v*(1-this.ks);
        this.out2.v=this.in1.v*(this.ks);
        this.out1.c=this.in1.c;
        this.out2.c=this.in1.c;
    }

}

function Mem(kV,kC) {
    this.kv = kV||0.15;
    this.kc = kC||0.95;
    this.in1 = null;
    this.out1 = new Stream();
    this.out2 = new Stream();
    this.calc = function () {
        this.out1.v = this.in1.v * this.kv;
        this.out1.c = this.in1.c * (1 - this.kc);
        this.out2.v = this.in1.v * (1 - this.kv);
        this.out2.c = (this.in1.v * this.in1.c - this.out1.v * this.out1.c) / this.out2.v;
        this.out1.selfCheck = this.out2.selfCheck = Math.abs
        (this.in1.v * this.in1.c - (this.out1.v * this.out1.c + this.out2.v * this.out2.c)) &lt; eps;

    }
}
A couple of format rules like:


Is a good practice declare first and then use it. Is not a big deal, but is a good practice.
Try to use, Pascal Case for constructors, and camelCase for methods.
You can replace some repeated function with inheritance javascript


Also, try to don´t abuse of the this. In javascript is a little tricky and can be changed depending of the context.
For default values use 

var something = original Value || default Value;


also, last thing most important for your calculator, take a look to the javascript floating points troubles maybe you can get wrong results.