There are currently 32 names in this directory beginning with the letter V.
Observable shaft of precipitation falling from a cloud but evaporates before reaching the ground.
A virus is an infectious agent that thrives inside the cells of other living organisms, including humans and other bacteria. Viruses can be transferred through air, insects, orally, through faecal matter, physical contact, via food and water, etc. Usually antibiotics are not effective against viruses, though antiviral drugs are.
A region in a fluid in which the flow is rotating around a straight or curved axis line. They form in stirred fluids and can be seen in smoke rings, whirlpools, in the wake of boat, or winds surrounding a tornado or dust devil. The fluid flow velocity is greatest next to its axis and decreases in inverse proportion to the distance from the axis.
A sensation of whirling and loss of balance, associated particularly with looking down from a great height, or caused by disease affecting the inner ear.
A liquid consisting of acetic acid, water and other chemicals, it is mainly used as a cooking ingredient or in pickling. As the most easily available mild acid, it has a variety of industrial, medical and domestic uses, like as a household cleanser.
A fat-soluble vitamin that is naturally present in very few foods. It is produced when UV rays from sunlight strike the skin and trigger its synthesis. It promotes calcium absorption and is required for bone growth. Without sufficient vitamin D, bones can become thin, brittle or misshapen.
Group of structurally similar, fat-soluble vitamins the body requires to synthesise certain proteins required for blood coagulation. Without Vitamin K, coagulation is seriously impaired. It is found in highest amounts in green leafy vegetables.
A method of packaging to removes air from the package prior to sealing with the intent of removing oxygen from the container to extend shelf life by limiting the growth of aerobic bacteria or fungi and preventing evaporation of volatile components.
The maximum degree of heel after which a vessel becomes unable to return to an upright position.
Occurs when once faint because the body overreacts to triggers such as the sight of blood or extreme emotional distress, causing a sudden drop in heart rate and blood pressure, leading to reduced blood flow to your brain, causing brief loss of consciousness.
General term for plant life in a particular region and the amount of ground cover they provide.
Used as a reference point for elevations of surfaces and features on the Earth including terrain, bathymetry, water levels, and man-made structures. Elevations are often cited in height above sea level, a tidal datum described as the arithmetic mean of the hourly water elevation taken over a specific 19 years cycle. This definition averages out tidal highs and lows and short term variations. Countries tend to choose the mean sea level at one specific point to be used as the standard “sea level” for all mapping and surveying in that country.
The highest altitude at which humans can survive and is generally agreed to be approximately 18,000 feet above sea level. Spending time above this altitude, health gradually declines due to a lack of oxygen and lower barometric pressure.
Very High Frequency (VHF)
The range of radio waves from 30 to 300 MHz. This is commonly used in digital television broadcast, two-way radios, Air Traffic Control communications systems, marine communications, etc. It is suited for short distance communication, generally a little further than line-of-sight.
The most common type of flare gun to launch flares for signalling for people at sea or from the ground to aircraft. It has a single action trigger mechanism, hammer action, center fire pin.
A steel cable running along the climbing route, fixed to the rock for climbers to secure themselves, preventing a fall.
A type of minimalist shoe manufactured by Vibram, originally marketed as a more natural alternative for different outdoors activities. The footwear is meant to replicate being barefoot and has thin, flexible soles that are contoured to the shape of the human foot, including visible individual sections for the toes.
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