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# Diesel and petrol boiling pressure?

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## Diesel and petrol boiling pressure?

(OP)
Please can anyone help me by indicating the boiling pressure of petrol and diesel which are used in cars,at normal temperature of 20°C?
Any help is appreciated.
Best regards

### RE: Diesel and petrol boiling pressure?

Use this handy thing http://www.sigmaaldrich.com/chemistry/solvents/lea...

Find your BP at atmospheric (middle line, set the LH to 20C and read off the RH scale.

Petrol is a bit hard as it's BP at atmospheric conditions is normally < 100C.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

### RE: Diesel and petrol boiling pressure?

Do you have the capability of doing the experiment yourself? What you would need is a vacuum pump (listed type for petrol)and a vacuum guage or you could have a certified lab do the experiment for you.

### RE: Diesel and petrol boiling pressure?

You'll first have to identify the component that represents the most volatile 0.5% v/v or 1% v/v of this product. Then use the link Little Inch has provided to get the sat vap pressure of this component at 20degC.

### RE: Diesel and petrol boiling pressure?

You certainly don't want the "boiling pressure" of these liquids at 20 deg C as they are not boiling at 20 deg C. What you are looking for is the vapor pressure. Gasoline blendss are classified by their Reid Vapor Pressure (RVP). The EPA publishes allowable RVP by location and time of year. They allow higher RVP in the winter because the temperatures are lower. Higher RVP helps cold starting.

http://www.epa.gov/gasoline-standards/gasoline-rei...

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