Which of the following is the unit of time in the SI system?

The unit of time in the SI (International System of Units) system is the second. The SI system is a standardized system of measurement used globally in science and engineering, ensuring consistency in data collection and analysis. The second is defined based on the vibration of cesium atoms, making it a precise measurement of time.

Other units mentioned, such as the kilogram and meter, correspond to mass and length, respectively. While the hour is also a commonly used unit of time, it is not part of the SI. Instead, the SI system specifically designates the second as the fundamental unit for measuring time. This distinction is crucial for standardized communication in scientific contexts.