3.1 Comparing winter and summer Petrol blends

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About 30-40% of each barrel of crude oil goes to make petrol. But you can see that its not as simple as just distilling off the right bit at the refinary and sending it to th petrol stations. Petrol has to be blended to get the right properties. One important property is its volatility. A mixture of petrol vapour and air is ignited in a cylinder in a car engine. The vapour-air mixture is made in the carburettor. When the weather is cold the petrol is difficult to vaporise, so the car is difficult to start. To get over this problem, petrol companies make different blends for different times of the year. During winter they put more voliatile components in


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