The density or more precisely the volumetric mass

The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume where ρ is the density, m is the mass, and V is the volume Density Mathematically, density is defined as mass divided by volume

Acid : A lower p. H means a higher acidity, and thus a higher concentration of hydrogen ions in the solution. Common examples of acids include hydrochloric acid Acid & Alkali A solution of a soluble base has a p. H greater than 7. 0 In chemistry, an alkali is a basic, ionic salt of an alkali metal or alkaline earth metal chemical element.

In chemistry, a solution is a homogeneous mixture composed of only one phase In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. Solutions The solvent does the dissolving The concentration of a solute in a solution is a measure of how much of that solute is dissolved in the solvent.

Micrometers are also used in telescopes or microscopes to measure the apparent diameter of celestial bodies or microscopic objects Micrometers are usually, but not always, in the form of calipers (opposing ends joined by a frame), which is why micrometer caliper is another common name. Micrometer The spindle is moved by turning the ratchet knob or thimble until the object to be measured is lightly touched by both the spindle and the anvil. The spindle is a very accurately machined screw and the object to be measured is placed between the spindle and the anvil.