120 may refer to:
- 120 (number), the number
- AD 120, a year in the 2nd century AD
- 120 BC, a year in the 2nd century BC
- 120 film, a film format for still photography
- 120 (film), a 2008 film
- 120 (MBTA bus), a Massachusettes Bay Transport Authority bus route
- 120 (New Jersey bus), a New Jersey Transit bus route
- 120 (Kent) Construction Regiment, Royal Engineers
- 120 volts, standard electrical mains voltage in several countries in the Americas
- Lenovo IdeaPad 120, a discontinued brand of notebook computers
- Ching Chung stop (MTR digital station code 120), a Light Rail stop in Tuen Mun, Hong Kong
- 120 Lachesis, a main-belt asteroid
- Škoda 120, a compact sedan
1/20 may refer to:
- January 20 (month-day date notation)
Twenty-Five or 25 may refer to:
- 25 (number)
- one of the years 25 BC, AD 25, 1925, 2025
3 (three) is a number, numeral and digit. It is the natural number following 2 and preceding 4, and is the smallest odd prime number and the only prime preceding a square number. It has religious and cultural significance in many societies.
4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is a square number, the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures.
Dry or dryness most often refers to:
- Lack of rainfall, which may refer to
- Dry or dry area, relating to legal prohibition of selling, serving, or imbibing alcoholic beverages
- Dry humor, deadpan
- Dryness (medical)
- Dryness (taste), the lack of sugar in a drink, especially an alcoholic one
- Dry direct sound without reverberation
Dry or DRY may also refer to:
V, or v, is the twenty-second letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is vee (pronounced ), plural vees.
A vacuum (pl.: vacuums or vacua) is space devoid of matter. The word is derived from the Latin adjective vacuus (neuter vacuum) meaning "vacant" or "void". An approximation to such vacuum is a region with a gaseous pressure much less than atmospheric pressure. Physicists often discuss ideal test results that would occur in a perfect vacuum, which they sometimes simply call "vacuum" or free space, and use the term partial vacuum to refer to an actual imperfect vacuum as one might have in a laboratory or in space. In engineering and applied physics on the other hand, vacuum refers to any space in which the pressure is considerably lower than atmospheric pressure. The Latin term in vacuo is used to describe an object that is surrounded by a vacuum.
The quality of a partial vacuum refers to how closely it approaches a perfect vacuum. Other things equal, lower gas pressure means higher-quality vacuum. For example, a typical vacuum cleaner produces enough suction to reduce air pressure by around 20%. But higher-quality vacuums are possible. Ultra-high vacuum chambers, common in chemistry, physics, and engineering, operate below one trillionth (10−12) of atmospheric pressure (100 nPa), and can reach around 100 particles/cm3. Outer space is an even higher-quality vacuum, with the equivalent of just a few hydrogen atoms per cubic meter on average in intergalactic space.
Vacuum has been a frequent topic of philosophical debate since ancient Greek times, but was not studied empirically until the 17th century. Clemens Timpler (1605) philosophized about the experimental possibility of producing a vacuum in small tubes. Evangelista Torricelli produced the first laboratory vacuum in 1643, and other experimental techniques were developed as a result of his theories of atmospheric pressure. A Torricellian vacuum is created by filling with mercury a tall glass container closed at one end, and then inverting it in a bowl to contain the mercury (see below).
Vacuum became a valuable industrial tool in the 20th century with the introduction of incandescent light bulbs and vacuum tubes, and a wide array of vacuum technologies has since become available. The development of human spaceflight has raised interest in the impact of vacuum on human health, and on life forms in general.
Wet may refer to:
- Moisture, the condition of containing liquid or being covered or saturated in liquid
- Wetting (or wetness), a measure of how well a liquid sticks to a solid rather than forming a sphere on the surface
Wet or WET may also refer to:
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