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metric system
The unit based on the length of a forearm was the cubit
the precision of the least precise measuement
1 min = 5 degree
the precision of the least precise measuement
The magnification in a microscope is the same for both length and width measurements when using the same objective lens. The magnification factor is determined by the combination of the objective and ocular lenses in the microscope, resulting in equal magnification for both dimensions.
metric system
Linear measurements in the metric system are based on the meter, which is the fundamental unit of length. Other units such as centimeters, millimeters, and kilometers are derived from the meter using prefixes.
The Richter scale is based on measurements of *Amplitude*. (^_^)
Older systems of measurement did not have sufficient precision, since they were based upon such things as the length of an arm, or the length of a foot, when different people have arms or feet that have different lengths.
The color of light is determined by its wavelength. Shorter wavelengths correspond to blue and violet light, while longer wavelengths correspond to red and orange light. The human eye perceives different colors based on the wavelength of light that enters it.
Common measurements in the metric system include meters for length, grams for mass, liters for volume, and seconds for time. These measurements are based on units of 10, making conversions between them easier than in other systems.
Scientists primarily use the International System of Units (SI) for measurements. The SI system is based on seven base units, including meters for length, kilograms for mass, and seconds for time. It provides a consistent and standardized way for scientists to communicate measurements and experimental results.
The Fujita scale was based on the damage caused by tornadoes. It was created to categorize tornadoes based on the estimated wind speeds and the severity of damage observed. The scale helps meteorologists and emergency response teams assess the impact of tornadoes and issue appropriate warnings.
Practically all measurements are based on physics.
Atomic mass. The modern table is based on atomic number.
The magnitude of an earthquake is based on measurements of amplitudes of seismic waves. This measurement provides an indication of the energy released at the earthquake's source.