Is Human Gas Flammable in Everyday Situations?

Is Human Gas Flammable?

Human gas, also known as flatulence, is the production of gas within the digestive system. While it can be an embarrassing and often humorous bodily function, many people have wondered whether human gas is flammable. In this article, we will explore the science behind flatulence and reveal the truth about its flammability.

The Composition of Human Gas

Human gas is primarily composed of nitrogen, oxygen, carbon dioxide, hydrogen, and methane. Methane is the gas responsible for the flammability of natural gas and is also found in small amounts in human gas. However, the concentration of methane in human gas is much lower compared to natural gas.

A typical composition of human gas is approximately 59% nitrogen, 21% hydrogen, 8% carbon dioxide, 7% oxygen, and 5% methane. This low methane content is one of the reasons why human gas is not highly flammable.

Is Human Gas Flammable in Everyday Situations?


Ignition Temperature and Flammability

For a substance to be flammable, it must have a specific ignition temperature. This is the minimum temperature at which the substance can ignite and sustain a fire. The ignition temperature of methane, the flammable component found in human gas, is approximately 600℃ (1112℉).

Now, think about the process of flatulence. When we pass gas, it discharges from the body at a normal temperature, which is around 37℃ (98.6℉). This temperature is significantly lower than the ignition temperature of methane. Therefore, human gas, in its natural state, is not flammable.

Is Human Gas Flammable in Everyday Situations?


Factors Affecting Flammability

While human gas in its natural state is not flammable, there are certain factors that could potentially increase its flammability:

  • Concentration of Methane: Although the concentration of methane in human gas is relatively low, if it were to increase significantly, it could potentially become flammable.
  • External Ignition Source: If an external ignition source, such as an open flame or a spark, were to come into contact with a concentrated release of methane-rich human gas, combustion could occur.
  • Enclosed Space: In an enclosed space, the concentration of methane could accumulate, making it potentially flammable if ignited.

It is important to note that these situations are highly unlikely to occur naturally during typical instances of passing gas in everyday life. Additionally, deliberately attempting to ignite human gas is not only dangerous but also unadvisable and can lead to injury.

Frequently Asked Questions Of Is Human Gas Flammable In Everyday Situations?

Can Human Gas Catch Fire?

Yes, human gas, commonly known as fart, can be flammable under certain conditions. When ignited, it can produce a flame due to the presence of methane and other flammable gases.

What Causes Human Gas To Be Flammable?

Flammable human gas is primarily caused by the presence of methane, a highly flammable gas that is released during digestion. Other gases such as hydrogen and sulfur compounds can also contribute to its flammability.

Is It Dangerous If Human Gas Catches Fire?

While the flame produced by human gas is generally not dangerous, it can be surprising and potentially embarrassing. However, in rare cases, excessive flammable gas production could indicate underlying digestive issues that should be evaluated by a healthcare professional.

How Can Human Gas Be Ignited?

Human gas can be ignited through the presence of an open flame, such as a lighted match or a lighter. It is worth noting that intentionally igniting human gas can be dangerous and should not be attempted without proper precautions.


Human gas, while containing small amounts of methane, is not highly flammable under normal circumstances. Its low methane concentration and the temperature at which it is expelled from the body make it unlikely to catch fire in everyday situations.

Nevertheless, it is always important to exercise caution around open flames or potential ignition sources, as safety should be our top priority. Understanding the composition of human gas and its flammability can help dispel any misconceptions and promote informed discussions on this peculiar topic.

Updated: January 4, 2024 — 6:40 am