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The lecithin to sphingomyelin ratio of 2:1 or greater is characteristic of mature fetal lungs. Fetuses delivered prior to this gestational age are at increased risk of neonatal respiratory distress syndrome.
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How do you determine the ratio of water to cement?
Concrete hardens as a result of the chemical reaction between cement and water so that for every 4 lbs of cement 1 lb of water is needed. The ratio is therefore 1:4 or 20%. This mix will be too dry so more water is needed than is technically necessary, the ratio should therefore be 35% to 40% and using a plasticizer
Can a petrol engine run on lean air-fuel ratio such as 30 by 1 while a diesel engine can?
No, the perfect fuel/air ratio is 14.6 to 1. A ratio of 13 to 1 is a safe ratio for most non turbo gas engines. Turbo engines can run a 12 to 1 ratio. Chrysler's lean burn system of the 70's and 80's used a ratio of around 18 to 1 and it was horrible. No gasoline engine can run at 30 to 1.
What is cement sand ratio in plastering?
The type of sand is also important. The right ratio for a mixture of cement and sand is 1:5 to 1:6
What is fuel air ratio?
Air to fuel ratio is the ratio between the weight of air to the weight of fuel, for example: 14.7 pounds of air to 1 pound of fuel would be a air:fuel ratio of 14.7:1 This particular example is called the stoichiometric ratio for gasoline...it's ideal ratio in order to efficiently use all the fuel. This ratio varies for different fuels....for example, ethanol fuels have a stoichiometric air:fuel ratio of 13.85:1. In actuality, a gasoline car gets it's best fuel mileage when the fuel is reduced slightly and produces it's best power when the ratio is a little heavier on the fuel side.
What is the sand to cement mix ratio for Type N masonry cement?
1:5 (cement:sand) is the best ratio
