# Measurement

## Eratosthenes’ Calculation of Earth’s Circumference

Eratosthenes’ Calculation of Earth’s Circumference The first person to measure the size of the earth was Eratosthenes, an ancient Greek scientist, about 2,000 years ago. Eratosthenes lived in the city of Alexandria,…

## Archimedes Buoyancy 2

Why is the submerged volume important to understand buoyancy? It is so famous that the 3rd century Greek philosopher Archimedes shouted “Eureka!” and ran out of the bathhouse in naked. （What did…

## Archimedes Buoyancy 1

Why is the submerged volume important to understand buoyancy? It is so famous that the 3rd century Greek philosopher Archimedes shouted “Eureka!” and ran out of the bathhouse in naked. （What did…

## Molecular Weight Calculator

Reset If you click on the each elements, the sum of the molecular weights is output as the atomic mass is added. For example, if you want to know the molecular weight…

## Digital Sampling

Run Sampling is the process of recording the values of a signal at given points in time. The number of samples taken during one second is called the sample rate. By increasing…

## a Clock

Clock This is a versatile watch. This can be used as a time monitor when discussing. This can be used as a monitor when measuring at constant intervals in the science room.…

## Distance and Displacement

Distance One of the most used concepts is “distance”, which means the total distance actually moved. If you move in zigzag, the actual distance traveled can be quite long even if the…