Tangible items or pictures used by scientists to represent invisible processes are called

Tangible items or pictures used by scientists to represent invisible processes are called Scientific Models

Explanation:

Scientific models can be both physical or non-physical and help to represent a theory or natural phenomenon. An example of a physical scientific model cab be the globe or an Orrey (model of the solar system)

Non-Physical scientific models consist of mathematical models or even economic models that can help to predict something or clearly present a theory.

A scientific model helps to present and explain an idea and apart from just students and it can be equally useful for professionals.

the chair is the committee member from the majority party who has the most seniority. in the south carolina senate, the chair is the committee member from the majority party who has the most committee seniority.