Enemy or foe is an individual or a group that is seen as forcefully adverse or threatening. The concept of an enemy has been observed to be basic for both individuals and communities.
A diffractometer (pronunciation: di-frak-'tÃ¤-m&-t&r) is a measuring instrument for analyzing the structure of a material from the scattering pattern produced when a beam of radiation or particles (such as X-rays or neutrons) interacts with it. Principle
In the past, hydrometers have also been referred to as gravimeters, densimeters or areometers. If the float section (see adjacent drawing) includes a built-in thermometer, the instrument is then referred to as a thermohydrometer. Scales. The many hydrometer scales that are commonly used include: Specific gravity (SG) The specific gravity of a liquid or solid is the dimensionless ratio of the density of the liquid or solid at a given reference temperature to the density of a given reference material at a given reference temperature.