Ethan leaned forward, eager to dive deeper into the mysteries of engineering. The Librarian opened the book to a new section, and a clear, detailed chart appeared in the air.
"Now," the Librarian began, "we'll focus on the International System of Units (SI), which consists of the seven fundamental units used worldwide. These units are the backbone of scientific and engineering measurements."
The chart illuminated the first unit. "The first unit is length, measured in meters (m). It's the basic measure of distance."
The chart then shifted to the next entry. "Next is mass, measured in kilograms (kg). It represents the amount of matter in an object."
"Following that," the Librarian continued, "is luminous intensity, measured in candelas (cd). This measures the power of light emitted in a specific direction."
The chart moved to another unit. "Temperature is measured in Kelvin (K). It's crucial for understanding thermal energy."
"Next," said the Librarian, "we have amount of substance, measured in moles (mol). This unit quantifies the number of particles in a substance."
The chart revealed the next unit. "Time is measured in seconds (s). It's fundamental to all measurements and calculations."
Finally, the Librarian pointed to the last unit. "The last fundamental unit is electric current, measured in amperes (A). This measures the flow of electric charge."
The chart faded, leaving Ethan with a solid understanding of the seven SI units.
"These units," the Librarian explained, "are essential for precise measurements and form the basis of the SI system. They allow scientists and engineers to communicate their findings and work consistently across the globe."
Ethan nodded, absorbing the significance of each unit. "I can see how important these units are. What's the next step in our exploration?"