To study the relativity of the length, we will analyze the following situation: we will imagine the same wagon of the previous item with the same conditions already established. As shown in the following figure, the wagon will go through a tunnel. We will adopt two benchmarks to measure the length of the wagon.
The atomic mass of the atom is expressed in u. Indicates how many times the mass of the atom is greater than 1/12 of the mass of the carbon atom (A = 12). When we measure a quantity, we compare it with another as a reference. To measure the mass of our body we use the kilogram (kg) as the standard unit. If the person has a mass of 80kg it means that his mass is 80 times greater than the mass of 1kg.
Until the mid-nineteenth century, it was believed that it was possible to build an ideal thermal machine, which would be able to transform all the energy supplied into work, obtaining a total yield (100%). To demonstrate that this would not be possible, French engineer Nicolas Carnot (1796-1832) proposed a theoretical thermal machine that behaved like a full yield machine, establishing a maximum yield cycle, which was later called the Carnot Cycle.
Nitriles are nitrogenous organic compounds that contain the functional group - C ≡ N. They can be called cyanides. The most common nitriles are hydrogen cyanide. Here are some examples: - Methanenitrile or hydrogen cyanide or hydrogen cyanide - It is a bitter almond-scented gas discovered in 1782.
Optical Isomery Optical spatial isomerism is one that has a carbon with four different ligands. We call this carbon asymmetric. It is identified with an asterisk (*). Asymmetric or chiral carbon - is the carbon atom that is bonded to four different groups.
Water on planet Earth Water is found everywhere: in the seas, rivers, lakes, clouds, groundwater, in the air, animals, plants, humans. Water is indispensable for life. Hydrosphere On our planet, there is a huge layer on the surface of the earth's crust that is covered with water.