Conversion of physical units (length, area, volume, mass, density...) As detailed as possible

The appendix of the modern Chinese dictionary contains

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1. What are the unit conversions between mass and density?
2. Is volume density? How to convert the common unit of density? For example, how to convert 1kg / m ^ 3 to 10 ^ - 3G / cm ^ 3?
3. To infer, it is similar to 1m / S = 3.6km/h
4. How to convert the molar ratio and the weight ratio? For example, the molecular weight of a is 52.02, the molecular weight of B is 102.02, and the mass ratio of a and B is 0.425? How to convert the molar ratio and weight ratio: for example, the molecular weight of substance A is 52.02, the molecular weight of substance B is 102.02, and the molar ratio of substance A to substance B is 0.425?
5. How does mass translate into mole ratio?
6. Molar ratio and mass ratio The molar ratio of nitric acid to cyclohexanol is 1.28 to 1, the molecular weight is 63 and 100, so the mass ratio is 80 to 100 Is this 80:100 in the same ml case? 400ml nitric acid is 600g, 400ml cyclohexanol is 400g, which seems different from 80:100. For example, in the experiment, 400ml nitric acid, 800ml cyclohexanol is 1.28:1, 400ml nitric acid is 600g, 800ml cyclohexanol is 800g, and the mass ratio is 80:100 That is, when the nitric acid is 600g, the cyclohexanol is 750g. Should the 750g be 40ml or 80ml?
7. How to convert atomic ratio and molar ratio? For example, in a compound, the molar ratio of Mg to CA is 1:100, so what is the atomic ratio of these two elements?
8. Molar ratio to find mass ratio The molar ratio of water and acetic acid is 5.8:1.0 The molar ratio of calcium to magnesium is 1.4:1.0
9. In physics, the relationship between density, mass, volume, and pressure
10. Does the influence of density have anything to do with mass, volume, temperature, state of matter and pressure
11. Conversion between physical density units These are the units t m.kg m.g cm Kg DM on the four. Conversion. Do not even wait. A group finished in the reverse. Please
12. What is the horsepower of Leydig diesel engine with rated power of 20.58kw per hour and rated power of 19.12kw per hour
13. The heat efficiency of a diesel engine is 25%. How much useful work can be done by completely burning 2kg diesel when this diesel engine works The thermal efficiency of a diesel engine is 25%. How much useful work can be done by completely burning 2kg diesel oil when the diesel engine works? (the heat released by completely burning 1kg diesel oil is 3.3 × 10 7J) Problem solving process
14. The efficiency of diesel engine is higher than that of gasoline engine because the calorific value of diesel engine is higher than that of gasoline engine Is that correct? Why?
15. What's the physical meaning of the efficiency of a diesel engine being 25 percent, The efficiency of diesel engine is 25%. What does it mean?
16. When a diesel engine with an efficiency of 40% outputs 66000j of useful work, the amount of diesel consumed__ kg? When a diesel engine with 40% efficiency outputs 66000j of useful work, the amount of diesel consumed is very small_____ The calorific value of diesel oil is 4.3 × 107 J / kg 66000 / 0.4 or 66000 * 0. I'm dizzy.
17. A diesel engine has a power of 70kw and a mechanical efficiency of 40%. It is known that the calorific value of diesel oil is 4.2 × 10 ^ 7J / kg. When it works normally, the amount of diesel oil consumed per minute is less Fs/mq*100%
18. A barrel of oil, even the barrel with oil 120kg, pour out 3 / 4 of the oil, even the barrel still weighs 45kg?
19. It costs 5.5 yuan per kilogram of vegetable oil. A barrel of vegetable oil weighs 23 kg. After half of the oil is sold, it weighs 14 kg. How much can this barrel of oil cost?
20. It costs 5.5 yuan per kilogram of vegetable oil. A barrel of vegetable oil weighs 23 kg. After half of the oil is sold, it weighs 14 kg. How much can this barrel of vegetable oil cost? No equations