Coal Tar:
Coal tar is a thick, black liquid produced by heating coal in the absence of air. It is a by-product of the process of making coke, a fuel that is used in steel production. Coal tar contains a variety of chemicals, including polycyclic aromatic hydrocarbons (PAHs), which are known to be carcinogenic (cancer-causing).

How is Coal Tar Produced?
Coal tar is produced by heating coal in the absence of air. This process, called pyrolysis, causes the coal to break down into several different components, including coke, gas, and coal tar. The coke is used as a fuel in steel production, while the gas is often used as a fuel for heating or electricity generation.

Uses of Coal Tar:
Coal tar has many different uses, including as a source of chemicals for the production of various products, such as dyes, medicines, and plastics. It is also used as a sealant for roofs and driveways, as well as a preservative for wood.

Environmental Impact of Coal Tar:
Coal tar is a toxic substance that can have serious environmental impacts. When coal tar is used as a sealant, for example, it can leach into nearby waterways and contaminate the surrounding ecosystem. In addition, the production of coal tar releases large amounts of greenhouse gases into the atmosphere, contributing to climate change.

Health Risks of Coal Tar:
Coal tar is a known carcinogen, meaning it can cause cancer. Exposure to coal tar can increase the risk of developing skin cancer, lung cancer, and other types of cancer. In addition, coal tar can cause skin irritation, respiratory problems, and other health issues.

Conclusion:
Coal tar is a by-product of the process of making coke, and it has many different uses. However, it is also a toxic substance that can have serious environmental and health impacts. It is important to take precautions to minimize exposure to coal tar and to develop alternative methods for producing the chemicals and products that currently rely on this substance.

A thick liquid type material formed in the absence of air is called coal tar