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Liquid is one of the principal states of matter. A liquid is a fluid that has the particles loose and can freely form a distinct surface at the boundaries of its bulk material. The surface is a free surface where the liquid is not constrained by a container.^[1]

A liquid's shape is confined to, not determined by, the container it fills. That is to say, liquid particles (normally molecules or clusters of molecules) are free to move about the volume, but they form a discrete surface that may not necessarily be the same as the vessel. The same cannot be said about a gas; it can also be considered a fluid, but it must conform to the shape of the container entirely.

At a temperature below the boiling point, a liquid will evaporate until, if in a closed container, the concentration of the vapors belonging to the liquid reach an equilibrium partial pressure in the gas. Therefore no liquid can exist permanently in a complete vacuum. The surface of the liquid behaves as an elastic membrane in which surface tension appears, allowing the formation of drops and bubbles. Capillarity is another consequence of surface tension. Only liquids can display immiscibility. The most familiar mixture of two immiscible liquids in everyday life is the vegetable oil and water in Italian salad dressing. A familiar set of miscible liquids is water and alcohol. Only liquids display wetting properties. Liquids at their respective boiling point change to gases (except when superheating occurs), and at their freezing points, change to solids (except when supercooling occurs). Even below the boiling point liquid evaporates on the surface. Objects immersed in liquids are subject to the phenomenon of buoyancy, which is also observed in other fluids, but is especially strong in liquids due to their high density. Liquid components in a mixture can often be separated from one another via fractional distillation.

The volume of a quantity of liquid is fixed by its temperature and pressure. Unless this volume exactly matches the volume of the container, a surface is observed. Liquids in a gravitational field, like all fluids, exert pressure on the sides of a container as well as on anything within the liquid itself. This pressure is transmitted in all directions and increases with depth. In the study of fluid dynamics, liquids are often treated as incompressible, especially when studying incompressible flow.

Liquid Subcategories Liquid Articles GBG 10 In One Liquid Vitamins MLM Home Business by Shannon Bishop Dec 29, 2008 Why You Should Take GBG Liquid Vitamin Supplement GBG Vitamins and minerals are critical for good health. We are supposed to get all needed nutrition directly from the food we eat on a daily basis. But for many people, that has becom... Coke Drops Toxic Additive Found in Liquid Vitamins but Not Powders by Jeannine Dowdell Dec 29, 2008 People buy liquid supplements to improve their health and because they absorb better than vitamin pills. But ironically, they could unwittingly be doing irreversible damage to their bodies. Studies show that the chemical makeup of any liquid vitami... The Difference Between Liquid Vitamins And Chewable Vitamins by Jake Saab Nov 26, 2008 Nearly 50% of Americans residing in the United States use some type of vitamin or vitamin supplement ever day. Even though they may take vitamins, most are unaware of the fact that nearly 90% of the nutrients and minerals found in the vitamin isn't p... What You Must Know About Liquid Collagen and Collagen Supplements by Laurel Levine Nov 26, 2008 http://www.beautiful-skin-site.com. ">Have you read about this recently? It seems more and more people seem to be turning to items such as liquid collagen in an effort to make... Liquid Body Balance by Stanley Griffith Nov 17, 2008 Over 6,000 health care providers agree before food or tablets can be assimilated into your system, they must first be converted into liquid by the digestive system. Liquid Vitamin let's you feel for yourself the amazing benefits of Natural Phytonutri... Liquid Master Cleanse Detox Diet by John Brenner Nov 13, 2008 Master Cleanse: Martha'S Vineyard Master Cleanse Detox The Raw Food Detox Master Cleanse Diet Natalie Rose Thus a child of seven to 10 years who would generally only require 2 000 kcal (8 400 kJ) per day would need to ingest 3 000 kcal (12 6... Important Mineral Magnesium! by Betty Hart Oct 16, 2008 Many of us suffer for months and years from chronic conditions, that no one seems to detect the source of (not even the so-called experts). Only a few lucky ones realize that the true source of these conditions is due primarily to a magnesium defi... Liquids Diet Plan - A Healthy Diet Plan by Dr John Anne Sep 02, 2008 In the today’s time most of the people are conscious about their figure and in this condition more and more people are attracting towards liquid diet. A clear liquid diet is made by some liquids and some foods that are in liquid at room temperature. ... Garden Of Life Liquid Vitamins: A Variety Of Important Benefits by Ben Pate Aug 16, 2008 It is essential that your body is getting the right amount of nutrients so that it is able to operate to its potential. It is not easy to obtain the proper amount of nutrients through the foods that you consume. There are a number of various healthy ...