Fuel → Fuel is any material that stores energy that can later be extracted to perform mechanical work in a controlled manner. Most fuels used by humans undergo combustion, a redox reaction in which a combustible substance releases energy after it ignites and reacts with the oxygen in the air. Other processes used to convert fuel into energy include various other exothermic chemical reactions and nuclear reactions, such as nuclear fission or nuclear fusion. Fuels are also used in the cells of organisms in a process known as cellular respiration, where organic molecules are oxidized to release usable energy. Hydrocarbons are by far the most common source of fuel used by humans, but many other substances, such as radioactive metals, are currently used as well .
Cars → An automobile, autocar, motor car or car is a wheeled motor vehicle used for transporting passengers, which also carries its own engine or motor. Most definitions of the term specify that automobiles are designed to run primarily on roads, to have seating for one to eight people, to typically have four wheels, and to be constructed principally for the transport of people rather than goods.
Gas → Gas is one of the three classical states of matter (the others being liquid and solid). Near absolute zero, a substance exists as a solid. As heat is added to this substance it melts into a liquid at its melting point (see phase change), boils into a gas at its boiling point, and if heated high enough would enter a plasma state in which the electrons are so energized that they leave their parent atoms from within the gas. A pure gas may be made up of individual atoms (e.g. a noble gas or atomic gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide). A gas mixture would contain a variety of pure gases much like the air. What distinguishes a gas from liquids and solids is the vast separation of the individual gas particles. This separation usually makes a colorless gas invisible to the human observer. The interaction of gas particles in the presence of electric and gravitational fields are considered negligible as indicated by the constant velocity vectors in the image.
More on trucks...
A truck is a vehicle for carrying goods and materials.
Truck or trucks may also refer to:
- Truck (band), a Malaysian pop group
- Trucks (band), a British pop-punk band
- Truck Festival and Truck Records, a British music festival and associated record label
- Trucks (short story), a short story by Stephen King
- Trucks (film), a 1997 TV film
- Truck (book), a children's picture book by Donald Crews
- Trucks!, television program
- Truck (rigging), a wooden ball, disk, or bun-shaped cap at the top of a mast
- Trucks or troco, a lawn game
- Trucks, part of a skateboard
- Bogies, called "trucks" in North American railroading
- Truck Acts, a legal act outlawing truck systems
- Truk Lagoon, a type of boat
- Truck farming, the cultivation of vegetable crops for transport to local markets
- "Truckin'", a Grateful Dead Song, released in 1970
- Truck system, the system of paying wages in goods instead of money
- "Space Truckin'", a Deep Purple Song, released in 1972
- The Truck, a 1980 Bulgarian film