Flammable gases need to reach a certain concentration in the air to catch fire, known as the lower flammability limit (LFL). Scientists have come up with a new way to predict LFLs by looking at the temperature needed to start a fire. They found that the rise in temperature at LFL is similar for different flammable gases, which is crucial for predicting LFLs in different situations, like when inert gases are added. This new approach helps in handling flammable gases safely.