Diseases, Conditions, Syndromes

DR Congo declares end to latest Ebola outbreak

The Democratic Republic of Congo declared its latest Ebola outbreak over on Monday, the World Health Organization said, more than two months after the virus re-emerged in the country's northwest.

Diseases, Conditions, Syndromes

Monkeypox found to be evolving at a faster rate than expected

A team of researchers at the National Institute of Health Doutor Ricardo Jorge in Portugal, working with a colleague at Lusófona University, also in Portugal, has found that the monkeypox virus has been evolving at a faster ...

Diseases, Conditions, Syndromes

No fewer deaths seen with restricted IV fluid for septic shock

For adults in the intensive care unit (ICU) with septic shock, intravenous fluid restriction does not result in fewer deaths at 90 days than standard intravenous fluid therapy, according to a study published online June 17 ...

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Fluid

In physics, a fluid is a substance that continually deforms (flows) under an applied shear stress, no matter how small. Fluids are a subset of the phases of matter and include liquids, gases, plasmas and, to some extent, plastic solids.

In common usage, "fluid" is often used as a synonym for "liquid", with no implication that gas could also be present. For example, "brake fluid" is hydraulic oil and will not perform its required function if there is gas in it. This colloquial usage of the term is also common in medicine and in nutrition ("take plenty of fluids").

Liquids form a free surface (that is, a surface not created by the container) while gases do not. The distinction between solids and fluid is not entirely obvious. The distinction is made by evaluating the viscosity of the substance. Silly Putty can be considered to behave like a solid or a fluid, depending on the time period over which it is observed. It is best described as a viscoelastic fluid. There are many examples of substances proving difficult to classify. A particularly interesting one is pitch, as demonstrated in the pitch drop experiment currently running at the University of Queensland.

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