British physicist is a term that encompasses a number of notable scientists who have made significant contributions to the field of physics. Lord Kelvin (6 letters), also known as William Thomson, was a prominent British physicist and mathematician who developed the absolute temperature scale and formulated the second law of thermodynamics. Niels Bohr (5 letters) was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory. Nikola Tesla (5 letters) was a Serbian-American inventor and engineer who made revolutionary advancements in the field of electricity and magnetism. James JOULE (5 letters) was an English physicist who studied the nature of heat and discovered the mechanical equivalent of heat.