Final answer:
A physical thing refers to an object or substance that exists in the physical world and can be detected, measured, and observed.
Step-by-step explanation:
Definition of a Physical Thing
A physical thing refers to an object or substance that exists in the physical world. It is something that can be detected, measured, and observed using our senses or scientific instruments. For example, a rock, a tree, a book, and a car are all physical things