Weights and Measures Day is observed on May 20 and celebrates the historical significance of international trade and the standardization of measurement systems. This day commemorates the signing of an international treaty known as the Metre Convention, which established a common system of weights and measures to facilitate trade and communication. The treaty was signed by representatives from 17 countries, and it has played a crucial role in resolving measurement discrepancies worldwide. As a result of this convention, several units of measurement, such as the meter, kilogram, and liter, were derived. Celebrations may include recognizing the importance of these standards in global commerce, although specific customs are not detailed in the text.