1-3 SI Measurements

It shows that our perception can be deceived, making measurements necessary.

It proves that all lines are perceived equally by everyone.

It demonstrates that illusions do not affect scientific measurements.

It shows that measurements are always accurate.

Geometric illusions

Measurement tools

Optical illusions

Mathematical symbols

The actual size of objects

The effect of surrounding shapes on perception

The measurement of circles

The use of color in measurement

SI stands for Systeme International d'Unites.

SI is based on seven base units.

All SI units are derived units.

Scientists use SI units for universal understanding.

SI units allow scientists to interpret each other's measurements universally.

SI is built upon seven metric units called base units.

Derived SI units are made from combinations of base units.

SI units are only used in France.

Mole

Kilogram

Candela

Kelvin

Joule

Pascal

Kelvin

Coulomb

Analog clock

Stopwatch

Digital calendar

Hourglass

Percent error is the difference between measured and true value divided by the true value, multiplied by 100%.

Percent error is the measured value divided by the true value, multiplied by 100%.

Percent error is the true value divided by the measured value, multiplied by 100%.

Percent error is the sum of measured and true value divided by 2, multiplied by 100%.