1 liter of water equals 2 kg, and 4 liters equals 8 kg. The mass of a liter of water is 1 l×1g/cm3 =1000cm3×1g/cm3 =1000g. It can also be understood that 4000 ml (that is, 4 liters) of water is equal to 4000 grams, that is, 8 kilograms. The density of oil is about 0.7 kg/m3 ~0.9 kg/m3, so 1 liter of oil is about 0.7~0.9 kg, that is, 1.4~ 1.8 kg.
It should be noted that for liquids with a density less than water, such as oil and wine, the weight of 4 liters of liquid will be less than 8 kg; For liquids with higher density than water, such as salt water and milk, the weight of 4 liters of liquid will be more than 8 kilograms. Therefore, to determine the weight of 4 liters of liquid, we must know the density of the liquid.
Application fields of promotion in life:
1. Fuel and lubricating oil: the capacity of liquid petrochemical products such as gasoline, diesel oil and lubricating oil is measured in liters.
2. Drinking water and drinks: liters are used to indicate the capacity of drinking liquids, such as bottled water, fruit juice and soda water.
3. Kitchen liquid: used to measure the capacity of cooking liquids such as cooking oil, soy sauce and vinegar.
4. Chemical reagents and drugs: Quantify the capacity of chemical reagents and liquid drugs used in pharmaceutical process in liters.
5. Automobile and transportation: used to describe the capacity of vehicle fuel tank and engine coolant.
6. Feed and agricultural liquid: used to indicate the capacity of livestock feed, pesticides, fertilizers, etc.
7. Household cleaning products: used to measure the capacity of laundry detergent, detergent, detergent, etc.
8. Medical equipment and medical supplies: used to describe the capacity of medical liquids, infusion bags, etc.