Thomas Midgley Jr.

Thomas was an inventor.

He found ways to use new things.

He helped make gas for cars. He added lead to it. This helped car engines run better. But lead can make people sick.

He also made a gas for fridges. This gas was called Freon. It helped keep things cold. Later, we learned it hurt the air.

Thomas had many awards for his work. He held over 100 patents. A patent is a way to own an idea.

He lived a long and busy life. He made many things that changed our world.

Thomas Midgley Jr. was an American engineer. He was a man who found new uses for many substances.

In 1921, he found a way to help car engines. He added a chemical called tetraethyl lead to gasoline. This stopped engines from knocking. Companies called this new fuel "Ethyl." However, lead is toxic, which means it can harm living things. Many people got sick from lead. Even Midgley got lead poisoning. He once showed that the fuel was safe by breathing in its vapor. Later, we learned that lead in the air caused many health problems.

Midgley also helped make Freon. These are chlorofluorocarbons, or CFCs. CFCs are gases used in fridges and air conditioners. They were safer to use than older gases that could explode. But CFCs caused a different problem. They harmed the ozone layer in the sky.

Midgley won many awards for his work. He held more than 100 patents. A patent is a legal right to an invention. In 1940, he became disabled by polio. He died in 1944. His inventions changed the world in big ways.

Thomas Midgley Jr. was a famous American engineer. He studied mechanical engineering at Cornell University. He graduated in 1911. Midgley was very good at finding new uses for substances. Even in high school, he used tree bark to change how baseballs flew. He was a man who wanted to solve big problems. He often carried a periodic table with him. This helped him search for new chemical discoveries.

In 1921, Midgley made a big discovery at General Motors. He found that adding tetraethyl lead, or TEL, to gasoline helped engines. This chemical stopped engines from knocking. Companies began selling this fuel as "Ethyl." They chose this name to avoid using the word lead. People thought it was a great way to make fuel better. However, lead is a toxic substance. This means it can be very harmful to living things.

Midgley knew that lead could make people sick. He even got lead poisoning himself in 1923. He had to take a long vacation in Miami to get fresh air. At a press conference in 1924, he tried to show the fuel was safe. He poured the chemical on his hands and breathed the vapor. Despite this, many workers got sick or died at chemical plants. New Jersey even ordered one plant to close. Eventually, leaded gasoline was banned because it harmed human health and the environment.

Midgley also worked on a new kind of cooling gas. Before this, fridges used gases that could explode or be toxic. Midgley and Albert Leon Henne created chlorofluorocarbons, or CFCs. They called this new gas Freon. It was much safer to use in air conditioners and refrigerators. It was even used in asthma inhalers. Midgley won many awards for this work. He received the Perkin Medal in 1937 and the Priestley Medal in 1941.

We now know that Midgley's inventions had huge impacts. CFCs were later found to harm the ozone layer in the sky. This led to the Montreal Protocol in 1987 to stop using them. Leaded gasoline also released huge amounts of lead into the air. This caused many long-term health problems for people. Midgley lived a life of many inventions and many mistakes. He held over 100 patents during his career. He died in Ohio in 1944 at age 55.

Thomas Midgley Jr. was a highly influential American mechanical and chemical engineer. Born on May 18, 1889, in Beaver Falls, Pennsylvania, he grew up in a family of inventors. His father worked with automobile tires, and his grandfather invented a tooth saw. Midgley graduated from Cornell University in 1911 with a degree in mechanical engineering. He possessed a unique talent for finding new uses for known substances. In high school, he even used slippery elm bark to change how baseballs curved. Throughout his career, he held more than 100 patents for his various inventions.

In 1921, Midgley made a major breakthrough while working at General Motors. He was searching for a way to stop "knocking" in internal combustion engines. Knocking is a loud, uneven sound caused by improper combustion. After testing several substances, he discovered that tetraethyl lead (TEL) prevented this issue. To market the product, companies used the name "Ethyl" to avoid mentioning lead. This additive was promoted as a superior and inexpensive alternative to ethanol-blended fuels. Midgley's work on motor fuels earned him the Nichols Medal in 1923.

However, the production of TEL was extremely dangerous for workers. Lead is an acutely toxic substance that can cause serious illness. In 1923, Midgley himself had to take a long vacation in Miami to recover from lead poisoning. He noted that his lungs had been affected by the work. At a prototype plant in Dayton, Ohio, staff members became deeply depressed due to the risks. By 1924, several deaths occurred at a DuPont plant in New Jersey. Even at a new plant in Bayway, New Jersey, workers suffered from hallucinations, insanity, and five deaths.

Despite these known hazards, Midgley attempted to prove the fuel was safe for the public. In October 1924, he held a press conference to demonstrate the safety of TEL. He poured the chemical over his hands and inhaled its vapor for sixty seconds. He claimed he could do this every day without any health problems. While the state of New Jersey briefly ordered a plant to close, federal intervention allowed production to restart in 1926. High-octane fuel enabled by lead eventually became very important for military use. However, the long-term environmental impact of lead in the atmosphere was much larger than anyone realized.

In the late 1920s, Midgley turned his attention to a different problem: refrigeration. Early cooling systems used substances like ammonia, methyl formate, or sulfur dioxide. These chemicals were often toxic, flammable, or even explosive. Midgley and Albert Leon Henne sought a non-toxic and non-flammable alternative. They focused on alkyl halides, which are combinations of carbon chains and halogens. They believed the stability of the carbon–fluorine bond would prevent dangerous breakdown products. This research led to the synthesis of dichlorodifluoromethane, the first chlorofluorocarbon (CFC).

This new substance was given the brand name Freon. Because it was stable and non-flammable, CFCs quickly replaced older refrigerants in air conditioners and fridges. They were also used as propellants in aerosol products and asthma inhalers. Midgley's success in this field brought him great professional recognition. He received the Perkin Medal in 1937 and the Priestley Medal in 1941. He was also elected to the United States National Academy of Sciences. These awards celebrated his ability to solve complex chemical engineering challenges.

Later scientific discoveries revealed that Midgley's inventions had massive negative consequences. While the dangers of lead were known during his life, the effects of CFCs were not understood until decades later. It was eventually discovered that CFCs deplete the ozone layer in the atmosphere. This led to the Montreal Protocol in 1987, which phased out the use of CFCs. Additionally, the release of lead from gasoline has been linked to neurological impairment and other health issues. Some historians suggest his inventions had a larger adverse impact on the atmosphere than almost any other single organism.

Midgley's life ended in a tragic way related to his own engineering. In 1940, he contracted polio, which left him severely disabled. To help him move, he designed an elaborate system of ropes and pulleys to lift himself out of bed. On November 2, 1944, he was found dead at his home in Worthington, Ohio. He had become entangled in his own device and died of strangulation. While some reported it was an accident, the coroner declared his death a suicide. His career remains a complex lesson in the unintended consequences of scientific progress.