1g water = 1ml; 1g alcohol = 1.25ml; 1g mercury = 0.075ml. This is determined based on the density of the liquid. Gram is a unit of mass and milliliter is a unit of volume, so this conversion is related to density.

Weight = volume .

Density reflects a property of the substance itself, which can therefore be affected by external factors. Generally speaking, the main physical quantities that affect the density of matter are pressure and temperature. The density of gases is obviously affected by pressure and temperature. Usually gases only give the density under standard conditions or at normal temperature and pressure. The density under other conditions can be determined by the equation of state of the gas (such as the ideal gas equation of state or van der Waals equation) calculation. ?

The density of a liquid mainly depends on the components of the liquid, and is relatively less affected by temperature (but sometimes it cannot be ignored). Very high pressures can also have a significant effect. The density changes of solids as a function of temperature and pressure are similar to those of liquids, and are generally less pronounced.