In Charles’s law, each line of the volume vs temperature graph is called ______.

Correct option is D

The correct answer is (d) isobars.
In Charles's law, which states that the volume of a gas is directly proportional to its temperature at constant pressure, each line on a volume vs. temperature graph is called an isobar. This is because Charles's law is based on the condition of constant pressure, and an isobar represents a process or line on a graph where pressure remains constant.
Information Booster: ● Charles's law applies to ideal gases and describes how volume changes with temperature at constant pressure. ● An isobar shows how volume varies with temperature when pressure is unchanged. ● Other terms commonly used in gas laws include isochore (constant volume) and isotherm (constant temperature). ● Isobars are significant in understanding how gases expand when heated, particularly in various thermodynamic processes.
Additional Knowledge:
· (Option a) Isochore: Incorrect; an isochore represents a line of constant volume, not applicable here.
· (Option b) Isotopes: Incorrect; isotopes refer to atoms of the same element with different numbers of neutrons, unrelated to gas laws.
· (Option c) Isotones: Incorrect; isotones are nuclei with the same number of neutrons, also unrelated to gas laws.
· (Option d) Isobars: Correct; each line on a volume vs. temperature graph under constant pressure is called an isobar, aligning with Charles's law.