Water (molecule)

This article is about the physical properties of pure water. For its distribution and importance in life, see Water. For other uses, see Water (disambiguation).
"H2O" and "HOH" redirect here. For other uses, see H2O (disambiguation) and HOH (disambiguation)

Water (H2O, HOH) is the most abundant molecule on Earth's surface, composing of about 70% of the Earth's surface as liquid and solid state in addition to being found in the atmosphere as a vapor. It is in dynamic equilibrium between the liquid and gas states at standard temperature and pressure. At room temperature, it is a nearly colorless (with a hint of blue), tasteless, and odorless liquid. Many substances dissolve in water and it is commonly referred to as the universal solvent. Because of this, water in nature and in use is rarely pure, and may have some properties different from those in the laboratory. However, there are many compounds that are essentially, if not completely, insoluble in water. Water is the only common substance found naturally in all three common states of matter—for other substances, see Chemical properties. Water is essential for all life on Earth. Water also usually makes up 55% to 78% of the human body.

Analyser

An analyser, also spelt analyzer, is a device that analyses given data. It examines in detail the structure of the given data and tries to find patterns and relationships between parts of the data. An analyser can be a piece of hardware or a software program running on a computer.

An analyser can also be an instrument or device which conducts chemical analysis (or similar analysis) on samples or sample streams. Such samples consist of some type of matter such as solid, liquid, or gas. Many analysers perform such analyses automatically or mostly automatically, such as autoanalysers.