A multiple vortex tornado has smaller, short-lived vortices moving around inside of it. The suction vortices have stronger winds than the rest of the tornado and are noted for cutting narrow curved swaths of intense damage. A multiple vortex tornado sometimes has the appearance of two or more tornadoes moving circles. A single vortex tornado is simply one vortex of tornadic wind.
One hole creates a vortex for particles to travel through, forcing all particles to move in a single direction; whereas, two holes create an anti-vortex, forcing all particles into the direction most relative to a particle's location, creating a reverse vortex.
A vortex tube is a mechanical device that separates compressed gas into cold and hot streams. It has no mechanical parts and is also known as the Ranque-Hilsch vortex tube.
vortices
A tornado is a kind of vortex, but there are other varieties of vortex with different driving mechanisms. A tornado is a vortex typically a few hundred to a few thousand feet wide that usually comes from a larger but less intense vortex called a mesocyclone, which is the result of a thunderstorm updraft interacting with wind shear. Large scale high and low pressure systems are also vortices driven by the Coriolis effect. You can also see a vortex in a draining pool of water.
There are two plurals, either hippopotamuses or hippopotami
The plural of automaton is automatons or automata
There is only one plural for criterion, which is criteria.
plurals and possessive
The plurals for Mrs Vandertramp are Mmes Vandertramp or Mesdames Vandertramp.
No country in particular calls tornadoes multi-vortex. Multi-vortex is a term used to describe a tornado that contains two or more smaller vortices inside the main vortex, regardless of where it occurs.
Nouns form their plurals in different ways depending on the noun. For most nouns, you add "-s" or "-es" to the end (e.g., cat - cats, box - boxes). Some nouns have irregular plural forms that do not follow this rule (e.g., child - children, tooth - teeth).
Plurals for six is simply sixes. Two sixes. Mathew :)
a vortex
Plurals don't use apostrophes, so the first one is correct.
There are two acceptable plurals - memorandums of understanding and memoranda of understanding.
Nouns ending in 'y' preceded by a vowel form their plurals by adding the letter 's'. Examples:one day, two daysone boy, two boysone play, two playsone blue-jay, two blue-jays