CountyLine 25 Ton Log Splitter with Kohler SH265 6.5HP Engine, 126151799

Twenty-Five or 25 may refer to:

• 25 (number)
• one of the years 25 BC, AD 25, 1925, 2025

6 (six) is the natural number following 5 and preceding 7. It is a composite number and the smallest perfect number.

An engine or motor is a machine designed to convert one or more forms of energy into mechanical energy.

Available energy sources include potential energy (e.g. energy of the Earth's gravitational field as exploited in hydroelectric power generation), heat energy (e.g. geothermal), chemical energy, electric potential and nuclear energy (from nuclear fission or nuclear fusion). Many of these processes generate heat as an intermediate energy form; thus heat engines have special importance. Some natural processes, such as atmospheric convection cells convert environmental heat into motion (e.g. in the form of rising air currents). Mechanical energy is of particular importance in transportation, but also plays a role in many industrial processes such as cutting, grinding, crushing, and mixing.

Mechanical heat engines convert heat into work via various thermodynamic processes. The internal combustion engine is perhaps the most common example of a mechanical heat engine in which heat from the combustion of a fuel causes rapid pressurisation of the gaseous combustion products in the combustion chamber, causing them to expand and drive a piston, which turns a crankshaft. Unlike internal combustion engines, a reaction engine (such as a jet engine) produces thrust by expelling reaction mass, in accordance with Newton's third law of motion.

Apart from heat engines, electric motors convert electrical energy into mechanical motion, pneumatic motors use compressed air, and clockwork motors in wind-up toys use elastic energy. In biological systems, molecular motors, like myosins in muscles, use chemical energy to create forces and ultimately motion (a chemical engine, but not a heat engine).

Chemical heat engines which employ air (ambient atmospheric gas) as a part of the fuel reaction are regarded as airbreathing engines. Chemical heat engines designed to operate outside of Earth's atmosphere (e.g. rockets, deeply submerged submarines) need to carry an additional fuel component called the oxidizer (although there exist super-oxidizers suitable for use in rockets, such as fluorine, a more powerful oxidant than oxygen itself); or the application needs to obtain heat by non-chemical means, such as by means of nuclear reactions.

Kohler is an occupational surname of German origin. It means "charcoal burner". Notable people with the surname include:

• Alan Kohler, Australian journalist
• Anton Kohler, German chess player
• Berthold Kohler (born 1961), German journalist
• Charles-Amédée Kohler (1790–1874), Swiss chocolate maker
• Ernesto Kohler (1849–1907), flautist and composer
• Fred Kohler, American actor
• Josef Kohler, German jurist
• Juliane Köhler, German actress
• Jürgen Kohler, former German football player
• Kaufmann Kohler (1843–1926), Reform rabbi
• Klaus J. Kohler, German phonetician
• Max J. Kohler, American lawyer
• Richie Kohler, shipwreck diver and historian
• Robert E. Kohler (born 1937), American chemist and historian of science
• Sheila Kohler, South African writer

Log most often refers to:

• Trunk (botany), the stem and main wooden axis of a tree, called logs when cut
  • Logging, cutting down trees for logs
  • Firewood, logs used for fuel
  • Lumber or timber, converted from wood logs
• Logarithm, in mathematics

Log, LOG or LoG may also refer to:

Ton is any of several units of measure of mass, volume or force. It has a long history and has acquired several meanings and uses.

As a unit of mass, ton can mean:

• the long ton, which is 2,240 pounds (1,016.0 kilograms)
• the tonne, also called the metric ton, which is 1,000 kilograms (about 2,204.6 pounds) or 1 megagram.
• the short ton, which is 2,000 pounds (907.2 kilograms)

Its original use as a unit of volume has continued in the capacity of cargo ships and in units such as the freight ton and a number of other units, ranging from 35 to 100 cubic feet (0.99 to 2.83 m³) in size. Recent specialized uses include the ton as a means of truck classification. It can also be used as a unit of energy, or in refrigeration as a unit of power, sometimes called a ton of refrigeration.

Because the ton (of any system of measuring weight) is usually the heaviest unit named in colloquial speech, its name also has figurative uses, singular and plural, informally meaning a large amount or quantity, or to a great degree, as in "There's a ton of bees in this hive," "We have tons of homework," and "I love you a ton."

With or WITH may refer to:

• With, a preposition in English
• Carl Johannes With (1877–1923), Danish doctor and arachnologist
• With (character), a character in D. N. Angel
• With (novel), a novel by Donald Harrington
• With (album), a 2014 album by TVXQ
• With (EP), a 2021 EP by Nam Woo-hyun