Understanding International Standards of Measurement

The question asks which system of measurement is accepted internationally and features seven specific base units. Let's examine the two systems mentioned: the Metric system and the Imperial or British system.

The Metric system is a decimal-based system of measurement. Over time, it evolved into the modern International System of Units, abbreviated as SI (from the French, Système International d'unités). The SI is the most widely used system of measurement in the world, used in science, commerce, and everyday life in most countries.

The SI system is defined by seven base units. These base units form the foundation for all other units in the system. The question correctly lists these seven fundamental quantities:

• Length: measured in metres ($\text{m}$)
• Mass: measured in kilograms ($\text{kg}$)
• Time: measured in seconds ($\text{s}$)
• Electric current: measured in amperes ($\text{A}$)
• Thermodynamic temperature: measured in kelvins ($\text{K}$)
• Amount of substance: measured in moles ($\text{mol}$)
• Luminous intensity: measured in candelas ($\text{cd}$)

These are exactly the seven base units mentioned in the question. The SI system is indeed the accepted international standard.

The Imperial or British system is a system of units originally defined in the British Weights and Measures Act of 1824. Examples of units in this system include the foot for length, the pound for mass, and the second for time. While the second is common to both systems, the Imperial system uses different base units for length and mass (among others) compared to the SI system. More importantly, the Imperial system is not the internationally accepted standard for measurement; its use is primarily limited to a few countries.

Comparing the two systems against the criteria in the question:

• The Metric system (SI) is the internationally accepted standard.
• The Metric system (SI) has seven base units for length, mass, time, electric current, temperature, amount of substance, and luminous intensity.
• The Imperial system is not the internationally accepted standard.
• The Imperial system does not have the same set of seven base units as defined by the international standard.

Therefore, the system that matches the description of being the international standard of measurement with the specified seven base units is the Metric system, specifically the International System of Units (SI) which evolved from it.

Based on this analysis, only the Metric system fits the description provided in the question.