In physical science, one may recognize theoretically between something like seven distinct parts of mass, or seven physical thoughts that include the idea of mass.[5] Every examination to date has demonstrated these seven qualities to be corresponding, and now and again equivalent, and this proportionality offers ascend to the conceptual idea of mass. There are various ways mass can be estimated or operationally characterized:

Inertial mass is a proportion of a question's protection from speeding up when a power is connected. It is controlled by applying a power to a question and estimating the increasing speed that outcomes from that power. A question with little inertial mass will quicken in excess of a protest with huge inertial mass when followed up on by a similar power. One says the group of more noteworthy mass has more prominent dormancy.

Dynamic gravitational mass[note 3] is a proportion of the quality of a question's gravitational transition (gravitational motion is equivalent to the surface vital of gravitational field over an encasing surface). Gravitational field can be estimated by permitting a little "test protest" to fall openly and estimating its free-fall speeding up. For instance, a protest in free fall close to the Moon is liable to a littler gravitational field, and consequently quickens all the more gradually, than a similar question would on the off chance that it were in free fall close to the Earth. The gravitational field close to the Moon is weaker in light of the fact that the Moon has less dynamic gravitational mass.

Latent gravitational mass is a proportion of the quality of a question's connection with a gravitational field. Aloof gravitational mass is controlled by partitioning a protest's weight by its free-fall speeding up. Two questions inside the equivalent gravitational field will encounter a similar increasing speed; in any case, the protest with a littler uninvolved gravitational mass will encounter a littler power (less weight) than the protest with a bigger detached gravitational mass.

Vitality additionally has mass as per the standard of mass– vitality equality. This proportionality is exemplified in a substantial number of physical procedures including pair creation, atomic combination, and the gravitational twisting of light. Match creation and atomic combination are forms in which quantifiable measures of mass are changed over to vitality, or the other way around. In the gravitational twisting of light, photons of unadulterated vitality are appeared to show a conduct like latent gravitational mass.

Arch of spacetime is a relativistic sign of the presence of mass. Such ebb and flow is amazingly feeble and hard to gauge. Hence, arch was not found until after it was anticipated by Einstein's hypothesis of general relativity. Amazingly exact nuclear tickers on the surface of the Earth, for instance, are found to quantify less time (run slower) when contrasted with comparable checks in space. This distinction in passed time is a type of bend called gravitational time expansion. Different types of ebb and flow have been estimated utilizing the Gravity Probe B satellite.

Quantum mass shows itself as a distinction between a protest's quantum recurrence and its wave number. The quantum mass of an electron, the Compton wavelength, can be resolved through different types of spectroscopy and is firmly identified with the Rydberg consistent, the Bohr sweep, and the established electron span. The quantum mass of bigger articles can be straightforwardly estimated utilizing a Watt balance. In relativistic quantum mechanics, mass is one of the final portrayal marks of the Poincaré gathering.