When this gas is burned what will happen to the surface of this type of star?

When a gas is burned in a star, it undergoes nuclear fusion, primarily converting hydrogen into helium in main-sequence stars. This process releases vast amounts of energy, which heats the star's surface and creates the light we see. As fusion continues, the balance between gravitational forces and the outward pressure from fusion can cause changes in the star's surface temperature and luminosity, potentially leading to various evolutionary stages, such as expanding into a red giant.