👉 Sizes math, also known as metric or SI (International System of Units), is a standardized system for measuring lengths, areas, volumes, and masses. It defines units based on the physical properties of the Earth and its interactions with other celestial bodies, ensuring consistency across scientific and everyday applications. For lengths, the base unit is the meter (m), which is defined as the distance light travels in a vacuum in 1/299,792,458 of a second. Larger units are derived from the meter, such as the kilometer (km = 1000 m), centimeter (cm = 1/100 m), and millimeter (mm = 1/1000 m). Areas are measured in square units, with the base being the square meter (m²), and larger units like square kilometers (km²) and hectares (ha = 10,000 m²). Volumes use cubic units, with the base being the cubic meter (m³), and larger units such as cubic kilometers (km³) and liters (L = m³ × 0.001). Masses are measured in kilograms (kg) as the base unit, with larger units like grams (g = 0.001 kg), milligrams (mg = 0.000001 kg), and micrograms (µg = 0.000001 kg). This system ensures precision and uniformity in scientific and practical measurements worldwide.
