In SCCM (Standard Cubic Centimeters per Minute ) S refers to Standard temperature and pressure T=273K and P=1am

So if you flow in a reactor at different pressure and/or temperature than S

You have to consider gas law equation to convert volumic flowrate from SCCM to CCM. For example at a standard temperature, increasing the pressure decrease the flow rate in CCM.

At P=1atm and T=273K 1SCCM= 1CCM

but at 2 atm and T=273K 1SCCM =0,5 CCM

the same for temperature (see attached)

https://www.inacom.nl/uploads/8/8/0/6/8806892/alicat-u-theory-pressure-flow.pdf

SCCM is Standard Cubic Centimeter per Minute, CC is cubic centimeter , I think the two(CC/min and SCCM) are almost same .

Thanks Yu!!!!

Dr. Singh

Hi, I suppose that they are approximately the same in lab condition. But, you can use aspen Hysys simulator, create a stream with the lab condition, and find the calibration factor.

Thanks Sadighi

Pramod,

You have to use gas law. 

Good suggestion here was using Hysys. What Hysys does is simply using gas law as described below.

PV=znRT .. If you want to convert from one unit to another then, for standard cubic centimeter you have P and T are standard conditions. By dviding the two equations you can get what you want:

P1V1=z1n1RT1 (std conditions: T is std, P is std and z = 1)

P2V2=z2n2RT2 (your conditions)

Divide the two equations and you will have: 

P2V2/P1V1 = z2n2RT2/z1n1RT1 .. > P2V2/P1V1 = z2T2/T1 (since n is the same and R is constant and z1 = 1)

You know P1 and T1 standard conditions and all you need to do is find z2 for your conditions and plug in your new T and your new P to find the V2 that is equivalent to your V1 (SCCM).

I mentioned Hysys is a good recommendation since you do not need to calculate z yourself and it automatically generates that once you define your stream composition.

Good luck

Thanks a lot!

SCCM and CC/Min both are same.

In SCCM (Standard Cubic Centimeters per Minute ) S refers to Standard temperature and pressure T=273K and P=1am

So if you flow in a reactor at different pressure and/or temperature than S

You have to consider gas law equation to convert volumic flowrate from SCCM to CCM. For example at a standard temperature, increasing the pressure decrease the flow rate in CCM.

At P=1atm and T=273K 1SCCM= 1CCM

but at 2 atm and T=273K 1SCCM =0,5 CCM

the same for temperature (see attached)

https://www.inacom.nl/uploads/8/8/0/6/8806892/alicat-u-theory-pressure-flow.pdf

They are essentially the same at standard atmospheric conditions

Hi I am planning to use monomethyl silane (MMS) to coat SiC on Carbon/Carbon Composites. To know how much of MMS is required if I want to run the CVD instrument for one hour, how do I calculate this? Please help.

Hi Santosh, you simply have to multiply the operation time (60 min for ex.) by the MMS flowrate expressed in ccm. To convert sccm to ccm you need to know the temperature T and the pressure P inside your CVD reactor (please see my former post).

Thank you Samir.