What makes a fart loud is a high volume of gas that is forced out through your tight anal sphincter, which causes the muscles to vibrate and create sound waves.
This sound is similar to a brass instrument, with it's volume and pitch changing based on the amount of gas, the force with which it's expelled, the size of your anal opening and the tightness of your sphincter.
When your anal sphincter muscles are tensed, they create a narrower opening and the gas pushing through the tight passage causes more vibration and a louder fart sound.
Fart noises are basically caused by vibrations as gas escapes your anus.
To let out the biggest fart, lay down flat and then pull your legs towards your head.
Then relax your rectum and let the air seep in slowly and then wait until you feel a fart forming your gut and then let it out.
The loudest fart that was ever recorded occurred on May 16, 1972 by a man named Alvin Meshits, at 194 decibels for a third of a second, resulting in recurring back pain.
However the loudest fart every recorded by Alvin Meshits is said to be exaggerated and unofficial and in reality the man named Alvin Meshits is a fictional person.
But according to the Guinness Book of World Records, the loudest officially recorded fart was 113 decibels and was recorded by Herkimer Chort in 1972.
There's also another unofficial claim of a loudest fart by Paul Hunn that was recorded at 118.1 decibels in 1972.
Alvin Meshits allegedly recorded a 194 decibel fart in Madeline, Texas, on May 16th 1972, although it's not an officially recognized record.
To let out the biggest fart, lay down flat and then pull your legs towards your head.
Then relax your rectum and let the air seep in slowly and then wait until you feel a fart forming your gut and then let it out.
The "deadliest fart" can be interpreted in two ways which can be the historical event where a Roman soldier's fart is linked to a riot that killed 10,000 people, and the theoretical, though not practically achievable, killing of someone through concentrated gasses.
Historically, the Roman incident is often cited due to its immense death toll, even though the direct causality is debated, say Reddit users and Today I Found Out.
Theoretically, a fart would need to be concentrated with lethal gases, which is not realistic under normal circumstances.