In physics the desire of an object to keep doing what it is doing is termed?

In Physics, the desire of an object to keep doing what it is doing is termed as Inertia.

Explanation:

Inertia is the quality of an object due to which it does nothing or remains unchanged.

According to Newton's first law of motion "An object at rest remains at rest or keeps moving in a straight line with uniform speed unless an external force is acted upon it."

This law is also known as the Law of Inertia.

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask