Vortex already is a singular form. The plural can be vortexes or vortices. Both are equally correct.
Phenomenon is the singular form of phenomena.
Quantum is singular, not singular possessive. The singular possessive form is quantum's.
The noun quantum is the singular form; the plural is quanta.
A tornado is a very intense vortex of air. Air spirals in towards the low pressure at the center of the tornado and is then drawn upwards. Most tornadoes form from a larger vortex called a mesocyclone, which is part of the updraft of some thunderstorms. At some point this vortex tightens and intensifies to form a tornado.
Pulleys is the plural form; the singular is pulley.
The noun vortex is a singular, common noun, a word for whirling fluid or air, a thing.
A vortex is form when the whirling motion of the cloud vortex results from a rapid downdraft of cold air replacing rising hot air.
Vortexes and Vortices
yes
The singular form of the demonstrative pronoun 'these' is this.
The singular form of feet is foot.
The singular form of "hypothysis" is "hypothesis."
A whirlpool is a kind of vortex. More specifically, a whirlpool is a vortex in water that can form from interacting currents. Different types of vortex can occur in air, water, or just about any liquid or gas.
The singular form is ombudsman.
it is already in its singular form.
The singular form is money.
The singular form of "cuffs" is cuff.