Compared to past, it is clear that most people now choose an automatic transmission car when buying a car. Because, with development of automotive technology, automotive technology with automatic transmissions continues to improve, and its performance is getting smoother and smoother. Although some car owners think that gearbox of a car with an automatic is not good, it is very convenient to operate while driving, which is obvious to all car owners. However, some car owners still prefer cars with a manual transmission, because cars with a manual transmission are very maneuverable.
For a long time, more and more attention was paid to issue of oil prices. Back in August, gasoline prices were still rising. Take No. 95 gasoline as an example, it went up to 8 yuan, so many car owners think that "time" is 8 yuan approaching, but recently price of oil has suddenly fallen again, which really pleases many car owners. I don't know if car owners have taken this into account in their daily lives. After so many years of driving, do you know what "1 liter of gasoline" is? We will analyze it in detail below.
Actually, in this matter, car owners and friends should first clarify that liters and kilograms are actually two different concepts: liters are volume, and kilograms are weight. However, in fact, these two concepts can be connected through a "third party", which means that most people know that this is density. I think everyone learned concept of density in physics class. It is more common that density of water at 25 degrees Celsius is 1 g/cm2. In other words, 1 liter of water and 1 kilogram of water are actually equivalent. But this is not case with gasoline, because car owners and friends know that density of gasoline is different from that of water.
But when it comes to density, another concept will come into play, namely temperature. In fact, it is meaningless to talk about density without temperature. At room temperature, that is, 25 degrees Celsius, generally speaking, density of gasoline No. 92 is 0.725 g/ml, however, gasoline No. 97 is different from No. 92, and its density is usually 0.737 g/ml. Therefore, based on this, if we replace a liter in concept of volume with a kilogram in weight, then weight of 1 liter of gasoline No. 92 is actually about 0.725 kg, so weight of 1 liter of gasoline No. 97 is actually about 0.737 kg. So oil and water are all they have very different weights.
Besides, since temperature is different, data we are talking about is also different. Because in case of thermal expansion and contraction, as temperature rises, density of gasoline will also decrease, and, conversely, with a decrease in temperature, density of gasoline will increase. For example, with regard to old No. 93 gasoline, everyone should know that at a temperature of 25 degrees Celsius, density of No. 93 gasoline is 0.741 g / ml, in other words, 1 liter of No. 93 gasoline is 0.741 kg. But once temperature reaches 15°C, density of No. 93 gasoline is 0.747 g/ml, and at this time, 1 liter of No. 93 gasoline is 0.747 kg.