Automobiles are four-wheeled vehicles used for passenger transportation on land. Generally, they run on a fuel such as gasoline or diesel.
Thousands of individual parts make up the modern automobile, similar to the human body in that they are arranged into several semi-independent systems with specific design functions. Some of these systems include the engine, the transmission, the cooling system, and the electrical system.
The internal combustion engine, invented in the late 1600s by Dutch scientist Christiaan Huygens, is at the heart of the modern car. A fuel that burns at high temperatures is delivered to the cylinders by means of tubes and other components, much in the same way that oxygen and carbon dioxide are delivered to the blood in the human body.
As of 2019, most automobiles use gas to fuel their engines, which then provide power to the wheels via a transmission. Some cars, especially SUVs (sport utility vehicles), also run on electricity from a battery or a hybrid electric system that uses both gas and electricity.
Most cars are designed for on-road use, but they also serve as trucks and buses. They are also available in a variety of configurations, such as sedans, coupes, station wagons, vans, and SUVs.
Historically, automobiles have made it possible for individuals to travel far from home and to distribute goods and services more efficiently. However, they also encourage sprawl, which degrades landscapes and produces traffic congestion.
Automobiles are also responsible for releasing large amounts of greenhouse gases into the atmosphere, a major cause of global warming. The United States Environmental Protection Agency estimates that cars are responsible for about 27 percent of the nation’s greenhouse gas emissions.
In the United States, a growing number of motorists have taken steps to reduce their carbon footprint by buying greener vehicles and driving less. The government also has introduced new technologies and regulations that require vehicle manufacturers to build safer vehicles.
The automobile has a long history in the United States. In the 1800s, it was used to move people from place to place and to provide jobs for people who could not find other work. It was also a major factor in the industrialization of America and changed many aspects of American life, including the economy.
It was the first industry to use an assembly line. The automobile gave Americans more freedom to move about, and it opened the door for the development of new industries and new jobs.
Today, the automobile is one of the world’s most important industries. It employs more than 70 million workers worldwide and is a significant source of economic activity.
A large percentage of automobiles are produced in the United States. The largest manufacturers are Ford, General Motors, and Chrysler.
Automobiles are made from a variety of materials, but the most common are steel and aluminum. Some are also manufactured from a combination of metals and plastics.
The chassis is the framework to which all of the other components of the automobile are attached. It must be strong enough to support the weight of the car, yet flexible in order to absorb shocks and tension. It must also be strong enough to hold the wheels and steering assembly.