The liquid specific gravity balance manufacturer analyzes the external factors of liquid density measurement:
1. Temperature: When the temperature of the organic compound liquid rises or falls, due to thermal expansion and contraction, the volume of the liquid will expand or shrink, and the density of the liquid will decrease or increase accordingly.
2. Pressure: When the pressure of the organic compound liquid increases or decreases, the volume of the liquid will also slightly decrease or increase, but the magnitude of the change is much smaller than that caused by the temperature change, so the pressure is caused The change in liquid density is smaller than that caused by temperature.
Liquid molecules are divided into polar molecules and non-polar molecules. There is only a very weak attraction between the molecules of non-polar liquids, called London dispersion force, and the attraction between the two polar molecules, in addition to the dispersion force, there are *dipole or *dipole and induction couple The force of interaction between the poles makes the arrangement of molecules closer. Therefore, in general, the liquid density of polar molecules is greater than that of non-polar molecules. In addition, the attraction between molecules of polar liquids is strengthened by the existence of intermolecular hydrogen bonds, so the liquid density of such compounds is usually higher.
4. Carbon chain length:
For the same series of non-polar liquids and liquids with extremely small dipole torches, the increase in the number of atoms in the molecule increases the gravitational force between the molecules, and the density of the liquid also increases. For polar liquids with larger dipole torches, the growth of the carbon chain will reduce the density of the liquid. This is because the growth of the carbon chain will make the molecular dipole torch smaller, and the intermolecular The attractive force of the light is also reduced, so the density is also reduced.
5. Is the molecular shape symmetrical:
The more symmetrical the shape of the compound molecule, the greater the density of the liquid. This is a molecule with a more symmetrical shape, and its molecular arrangement is closer, so the attraction between the molecules is larger. The internal factors that affect liquid density are closely related to the chemical structure of liquid molecules. Therefore, when discussing the liquid density of organic compounds, the chemical structure is an extremely important factor.
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