### Solution:

Concept: The study of fluid motion, whether it be water or another type, is known as hydrodynamics. Thus, the study of any form of fluid in motion falls under this discipline of physics.Dynamics is the area of physics concerned with the investigation of forces and their impact on the motion of bodies. Most people associate the word "dynamics" with Newton's second law of motion. Aerodynamics, thermodynamics, fluid dynamics, and other topics are a few typical examples of dynamics studies.

The area of physics that specifically examines the idea of fluids at rest is known as hydrostatics. As well

encompasses researching the circumstances in which fluids are at rest or in stable equilibrium as well as the pressure that a fluid exerts on a submerged body.

Fluid dynamics is a discipline of physics that encompasses the study of the movement of fluids, such as liquids and gases. Hydrodynamics is a subset of fluid dynamics. The study of hydrodynamics benefits from the use of Bernoulli's equation.

Thermometry is the technique of measuring temperature and doing numerous computations to convert temperature across different scales.

As a result, selection 3 is the right response.