# Measurement

## Michelson Interferometer

Michelson interferometer The Michelson interferometer was invented by the American physicist Michelson. Although it has a simple structure, it can...

## Minkowski Spacetime

Minkowski Spacetime Minkowski spacetime (or Minkowski space) is a coordinate system devised by German mathematician Minkowski. The peculiar thing is...

## Special Relativity: Length Contraction

CAUTION: Read the following instructions to the end to get the result that the moving object appears to be constricted...

## Special Relativity: Time dilation

The meanings of the symbols used in this simulation are as follows. L = Distance that light travels in a...

## Eratosthenes’ Calculation of Earth’s Circumference 2

Eratosthenes’ Calculation of Earth’s Circumference The first person to measure the earth’s size was Eratosthenes, an ancient Greek scientist about...

## How to use a multimeter

Multimeter A multimeter is a measuring device that combines various measurement functions such as voltage, current, and resistance. Multimeters are...

## Structure of an ammeter

Ammeter The strength of the current in the electrical circuit is measured using an ammeter. There is a rotor with...

## Gulliver’s Nutrition

Why did the King of Lilliput serve 1728 meals to Gulliver? This is because the volume of two objects that...

## Spring Scales

A spring scale is a tool that measures the mass and gravity of an object using the spring’s elastic force....

## Eratosthenes’ Calculation of Earth’s Circumference

Eratosthenes’ Calculation of Earth’s Circumference The first person to measure the earth’s size was Eratosthenes, an ancient Greek scientist about...

## Archimedes Buoyancy 2

Why is the submerged volume important to understand buoyancy? It is so famous that the 3rd-century Greek philosopher Archimedes shouted...