Clark Kent - a Kryptonian living on Earth - exhibits his invulnerability by walking through large bodies of fire and emerging completely unaffected with only his clothes burning, as seen in 2015's Man of Steel. This power is due to his doubled molecular structure as a Kryptonian.

Invulnerability - also called Indestructibility or Invincibility - is a complete resistance to physical injuries in which the bones cannot break and the skin is rendered impenetrable as well as retardant to any harming agents such as fire or chemicals. This power may have limits.