Complementary measurements are now being prepared in which the mass of mercury that fills a box of fused silica is to be found.

The chemical and isotopic compositions of the samples cannot be specified with an accuracy corresponding to that of the measurements, but evidence is given indicating that our results should represent the density of pure mercury of average isotopic constitution to between 1 and 2 p.p.m. The corresponding value at 0В° C, calculated from the thermal expansion formula of Beattie, Blaisdell, Kaye, Gerry & Johnson (1941) is 13.595086 g/cm3. Density of Mercury in a few select units of density measurement: Density of Mercury g cm3 13.53 g/cmВі. The mean density at 20В° C and 1 atm pressure of four samples of mercury from different sources is 13.545892 g/cm3, the range of the four values being 1.1 p.p.m. Secondly, and more important, the effective volume of the cube may be greater than the measured volume through layers of grease adhering to it despite very careful cleaning and the corresponding error probably varied from one group of weighings to another it is difficult to estimate but is thought to be between 0.2 and 1 p.p.m. First, all measurements of the temperature of the mercury are subject to a constant error which may reach 0.001 В° C, equivalent to 0.2 p.p.m. The uncertainty in the density of any one sample of mercury is however greater, for two reasons, than the value of 0.3 p.p.m. and the measured weight of the cube in any one sample of mercury at 20В° G has a standard deviation of 0.28 p.p.m. The determined mass of the cube has a standard deviation of 0.1 p.p.m. It was lapped with diamond dust to such an accurate form and good surface finish that the standard deviation of the volume of mercury displaced, as calculated from optical interference measurements of the dimensions of the cube, is 0.15 p.p.m. The cube is of tungsten carbide sintered with cobalt, its sides are 8.9 cm long, it weighs 9.7 kg in air and 217 g in mercury at 20В° C. The densities of four samples of mercury have been measured by finding the mass of mercury displaced by an accurately formed cube of known volume that just sinks in mercury. An analytical curve for the determination of mercury in such mixtures as were employed can be gotten from the data and the equation of the curve can be derived from the formulae derived from the theory given.This paper gives an account of the absolute measurement of the density of mercury at 20В° C in units of length and mass, the result of which is probably correct to one part in a million. The relation of this investigation to the practices of quantitative spectrochemical analysis is pointed out. The measured values were found to be in good agreement with those given by the formulae. People learned to make this metal from the. Mercury element has been known for thousands of years.

It is characterized as a heavy, silvery-white metallic liquid at room temperature that is odorless. Mercury has been used in manufacturing, as well as in dental and medical equipment, fertilizers, and pesticides. Theoretical formulae were developed for the relationship between the intensities of the mercury lines and the density of the mercury vapor (abundance of mercury). The density of mercury at 20 degree C to be 13545.848 kg/m3. Mercury is a naturally occurring trace metalloid element and known neurotoxin with atomic symbol Hg, atomic number 80, and atomic weight 200.59. Tests indicated that the ideal conditions were closely approximated. chemical symbol: Hg metal, silver-colored liquid in room temperature high density high surface tension breaks up easily into many small droplets dissolves. The source consisted of a normal low voltage arc and this source was used because it closely approximates the simple ideal source desired namely, one in which electrons of definite and controlled energy are projected through a space containing mercury and possibly other atoms so that an electron may not make more than one exciting or ionizing collision in its passage through the gas. The variation in the intensities of mercury lines with the abundance of mercury present was investigated experimentally both for mercury alone and for mercury vapor in a mixture with another gas.

Density of mercury