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Calculators >>> Atmosphere.

JavaScript can help you do atmospheric computations.

Select unit system: English Metric


Inputs

Altitude
Speed
Reference Length



Results

Temperature
Density
Pressure
Speed of Sound
Viscosity
Mach Number
Dynamic Pressure
Critical Cp
Vacuum Cp
Reynolds Number
Laminar Cf
Turbulent Cf

Add the below code to the <body> section of your page:

 
<script language="javascript" type="text/javascript">
<!-- Original: Ilan Kroo kroo@leland.stanford.edu
/* Visit http://www.yaldex.com/ for full source code
and get more free JavaScript, CSS and DHTML scripts! */
<!-- Begin
function setEUnits() {
var str = document.inputs.hunits.value;
if ( str== "ft") {
alert("Already in English Units.");
return;
}
document.inputs.hunits.value = "ft"
document.inputs.vunits.value = "ft/sec"
document.inputs.lunits.value = "ft"
document.results.tunits.value = "deg R"
document.results.runits.value = "sl/ft^3"
document.results.punits.value = "lb/ft^2"
document.results.sunits.value = "ft/sec"
document.results.muunits.value = "lb sec/ft^2"
document.results.qunits.value = "lb/ft^2"
var h = document.inputs.alt.value;
var v =document.inputs.speed.value;
var rl = document.inputs.rlength.value;
var tempVal = document.results.temp.value
var rhoVal = document.results.rho.value
var pVal = document.results.press.value
var soundVal = document.results.ssound.value
var viscVal = document.results.visc.value
var machVal = document.results.mach.value
var qVal =document.results.q.value
var cpstarVal = document.results.cpstar.value
var cpminVal = document.results.cpmin.value
var reynolds = document.results.reno.value
var cflam = document.results.cfl.value
var cfturb = document.results.cft.value
document.inputs.alt.value = h*3.2808
document.inputs.speed.value = v*3.2808
document.inputs.rlength.value = rl*3.2808
document.results.temp.value =tempVal*1.8
document.results.rho.value = rhoVal * .068521 * .028317
document.results.press.value = pVal * .020885
document.results.ssound.value = soundVal*3.2808
document.results.visc.value = viscVal*.22481*.092903
document.results.mach.value = machVal
document.results.q.value = qVal * .020885
document.results.cpstar.value = cpstarVal
document.results.cpmin.value = cpminVal
document.results.reno.value = reynolds
document.results.cfl.value = cflam
document.results.cft.value = cfturb
roundAll();
}
function setMUnits() {
var str = document.inputs.hunits.value;
if ( str== "m") {
alert("Already in metric units.");
return;
}
Compute();
document.inputs.hunits.value = "m"
document.inputs.vunits.value = "m/sec"
document.inputs.lunits.value = "m"
document.results.tunits.value = "deg K"
document.results.runits.value = "kg/m^3"
document.results.punits.value = "N/m^2"
document.results.sunits.value = "m/sec"
document.results.muunits.value = "N sec/m^2"
document.results.qunits.value = "N/m^2"
var h = document.inputs.alt.value;
var v = document.inputs.speed.value;
var rl = document.inputs.rlength.value;
var tempVal = document.results.temp.value
var rhoVal = document.results.rho.value
var pVal = document.results.press.value
var soundVal = document.results.ssound.value
var viscVal = document.results.visc.value
var machVal = document.results.mach.value
var qVal =document.results.q.value
var cpstarVal = document.results.cpstar.value
var cpminVal = document.results.cpmin.value
var reynolds = document.results.reno.value
var cflam = document.results.cfl.value
var cfturb = document.results.cft.value
document.inputs.alt.value = h/3.2808
document.inputs.speed.value = v/3.2808
document.inputs.rlength.value = rl/3.2808
document.results.temp.value =tempVal/1.8
document.results.rho.value = rhoVal / .068521 / .028317
document.results.press.value = pVal / .020885
document.results.ssound.value = soundVal/3.2808
document.results.visc.value = viscVal/.22481/.092903
document.results.mach.value = machVal
document.results.q.value = qVal / .020885
document.results.cpstar.value = cpstarVal
document.results.cpmin.value = cpminVal
document.results.reno.value = reynolds
document.results.cfl.value = cflam
document.results.cft.value = cfturb
roundAll();
}
function ResetForm() {
document.inputs.alt.value = "0.0"
document.inputs.speed.value = "1.0"
document.inputs.rlength.value = "1.0"
}
function Compute() {
// First set to English Units
var origUnits = "english";
var str = document.inputs.hunits.value;
if ( str== "m") {
origUnits = "metric";
setEUnits();
}
var h = document.inputs.alt.value;
var v =document.inputs.speed.value;
var rl = document.inputs.rlength.value;
var TEMPSL = 518.67;
var RHOSL = 0.00237689;
var PRESSSL = 2116.22;
var saTheta = 1.0
var saSigma = 1.0
var saDelta = 1.0
if ( h<232940 ){
saTheta = 1.434843 - h/337634;
saSigma = Math.pow( 0.79899-h/606330, 11.20114 );
saDelta = Math.pow( 0.838263-h/577922, 12.20114 );
}
if ( h<167323 ){
saTheta = 0.939268;
saSigma = 0.00116533 * Math.exp( (h-154200)/-25992 );
saDelta = 0.00109456 * Math.exp( (h-154200)/-25992 );
}
if ( h<154199 ){
saTheta = 0.482561 + h/337634;
saSigma = Math.pow( 0.857003+h/190115, -13.20114 );
saDelta = Math.pow( 0.898309+h/181373, -12.20114 );
}
if ( h<104987 ){
saTheta = 0.682457 + h/945374;
saSigma = Math.pow( 0.978261+h/659515, -35.16319 );
saDelta = Math.pow( 0.988626+h/652600, -34.16319 );
}
if ( h<65617 ){
saTheta = 0.751865;
saSigma = 0.297076 * Math.exp( (36089-h)/20806 );
saDelta = 0.223361 * Math.exp( (36089-h)/20806 );
}
if ( h<36089 ){
saTheta = 1.0 - h/145442;
saSigma = Math.pow( 1.0-h/145442, 4.255876 );
saDelta = Math.pow( 1.0-h/145442, 5.255876 );
}
var tempVal = TEMPSL * saTheta;
var rhoVal = RHOSL * saSigma;
var pVal = PRESSSL * saDelta;
var viscVal = 0.0226968*Math.pow( tempVal, 1.5 ) / ((tempVal)+198.72) / 1000000.0;
var soundVal = Math.sqrt( 1.4*1716.56*(tempVal) );
var machVal = v/soundVal
var qVal = 0.7*pVal*machVal*machVal
var reynolds = v*rl*rhoVal/viscVal
var cfturb = 0.455/Math.pow((Math.log(reynolds)/Math.log(10)),2.58)
var cflam = 1.328/Math.sqrt(reynolds)
document.results.temp.value = tempVal
document.results.rho.value = rhoVal
document.results.press.value = pVal
document.results.ssound.value = soundVal
document.results.visc.value = viscVal
document.results.mach.value = machVal
document.results.q.value = qVal
document.results.cpstar.value = (Math.pow((1/1.2 + machVal*machVal/6.0),3.5)-1)/(0.7*machVal*machVal)
document.results.cpmin.value = -1.0/(0.7*machVal*machVal)
document.results.reno.value = reynolds
document.results.cfl.value = cflam
document.results.cft.value = cfturb
if (origUnits == "metric") {
setMUnits();
}
roundAll();
}
// Rounding
function roundAll(){
document.inputs.alt.value = truncNum(document.inputs.alt.value,9)
document.inputs.speed.value = truncNum(document.inputs.speed.value,7)
document.inputs.rlength.value = truncNum(document.inputs.rlength.value,7)
document.results.temp.value =truncNum(document.results.temp.value,7)
document.results.rho.value = truncNum(document.results.rho.value,7)
document.results.press.value = truncNum(document.results.press.value,7)
document.results.ssound.value = truncNum(document.results.ssound.value ,8)
document.results.visc.value = truncNum(document.results.visc.value,10)
document.results.mach.value = truncNum(document.results.mach.value,6)
document.results.q.value = truncNum(document.results.q.value,7)
document.results.cpstar.value = truncNum(document.results.cpstar.value,6)
document.results.cpmin.value = truncNum(document.results.cpmin.value,6)
document.results.reno.value = truncNum(document.results.reno.value,9)
document.results.cfl.value = truncNum(document.results.cfl.value,7)
document.results.cft.value = truncNum(document.results.cft.value,7)
return;
}
function truncNum(inputVal, rsize) {
var instr = " " + inputVal
var inputlength = instr.length
if (inputlength<=rsize+1) return instr.substring(1, inputlength);
var epos = strpos(instr, "e")
if ( epos > rsize+1) {
var instr1 = instr.substring(1,rsize+1) + instr.substring(epos,inputlength);
return instr1;
}
var rounded = instr.substring(1, rsize+1);
return rounded;
}
function strpos(str, ch) {
for (var i = 0; i < str.length; i++)
if (str.substring(i, i+1) == ch) return i;
return -1;
}
// End -->
</script>
<center>
<FORM name = "units">
Select unit system:
<INPUT TYPE="radio" VALUE="radio" NAME="unitbut" CHECKED="true" onClick="setEUnits()">English
<INPUT TYPE="radio" VALUE="radio" NAME="unitbut" onClick="setMUnits()">Metric
</FORM>
<p>
<HR>
<H3>Inputs</H3>
<FORM name="inputs">
<table>
<tr>
<td>Altitude</td>
<td><INPUT NAME="alt" TYPE=text VALUE="0.0" SIZE=15></td>
<td><INPUT NAME="hunits" TYPE=text SIZE=6 VALUE="ft"></td>
</tr>
<tr>
<td>Speed</td>
<td><INPUT NAME="speed" TYPE="text" VALUE="1.0" SIZE="15"></td>
<td><INPUT NAME="vunits" TYPE="text" SIZE="6" VALUE="ft/sec"></td>
</tr>
<tr>
<td>Reference Length</td>
<td><INPUT NAME="rlength" TYPE="text" VALUE="1.0" SIZE="15"></td>
<td><INPUT NAME="lunits" TYPE="text" SIZE="6" VALUE="ft"></td>
</tr>
</table>
<BR>
<BR>
<INPUT NAME="name" TYPE="button" VALUE="Compute" onClick="Compute()">
<INPUT NAME="name" TYPE="button" VALUE="Reset" onClick="ResetForm()">
</FORM>
<HR SIZE="4">
<H3>Results</H3>
<FORM name = "results">
<table>
<tr>
<td>Temperature</td>
<td><INPUT NAME="temp" TYPE="text" SIZE="15"></td>
<td><INPUT NAME="tunits" TYPE="text" SIZE="8" VALUE="?R"></td>
</tr>
<tr>
<td>Density</td>
<td><INPUT NAME="rho" TYPE="text" SIZE="15"></td>
<td><INPUT NAME="runits" TYPE="text" SIZE="8" VALUE="sl/ft^3"></td>
</tr>
<tr>
<td>Pressure</td>
<td><INPUT NAME="press" TYPE="text" SIZE="15"></td>
<td><INPUT NAME="punits" TYPE="text" SIZE="8" VALUE="lb/ft^2"></td>
</tr>
<tr><td>Speed of Sound</td>
<td><INPUT NAME="ssound" TYPE="text" SIZE="15"></td>
<td><INPUT NAME="sunits" TYPE="text" SIZE="8" VALUE="ft/sec"></td>
</tr>
<tr>
<td>Viscosity</td>
<td><INPUT NAME="visc" TYPE="text" SIZE="15"></td>
<td><INPUT NAME="muunits" TYPE="text" SIZE="11" VALUE="lb sec/ft^2"></td>
<tr></tr>
</tr>
<tr>
<td>Mach Number</td>
<td><INPUT NAME="mach" TYPE="text" SIZE="15"></td>
</tr>
<tr>
<td>Dynamic Pressure</td>
<td><INPUT NAME="q" TYPE="text" SIZE="15"></td>
<td><INPUT NAME="qunits" TYPE="text" SIZE="8" VALUE="lb/ft^2"></td>
</tr>
<tr>
<td>Critical Cp</td>
<td><INPUT NAME="cpstar" TYPE="text" SIZE="15"></td>
</tr>
<tr>
<td>Vacuum Cp</td>
<td><INPUT NAME="cpmin" TYPE="text" SIZE="15"></td>
<tr>
</tr>
</tr>
<tr>
<td>Reynolds Number</td>
<td><INPUT NAME="reno" TYPE="text" SIZE="15"></td>
</tr>
<tr>
<td>Laminar Cf</td>
<td><INPUT NAME="cfl" TYPE="text" SIZE="15"></td>
</tr>
<tr>
<td>Turbulent Cf</td>
<td><INPUT NAME="cft" TYPE="text" SIZE="15"></td>
</tr>
</table>
</FORM>
</center>

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