Read each measurement to the correct number of significant figures. Laboratory glassware should always be read from the bottom of the meniscus. Digital balances normally display mass to the correct number of significant figures for that particular balance.

Key Concepts

Significant Figures

Significant figures are the digits in a number that contribute to its precision. This includes all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal portion. Understanding significant figures is crucial for accurately reporting measurements in scientific contexts, as they indicate the certainty of the measurement.

Meniscus Reading

The meniscus is the curve at the surface of a liquid in a container, such as a graduated cylinder or a beaker. When measuring liquid volumes, it is essential to read from the bottom of the meniscus to ensure accuracy. This practice helps avoid parallax errors and ensures that the measurement reflects the true volume of the liquid.

Digital Balance Accuracy

Digital balances are designed to provide precise mass measurements, typically displaying results to the correct number of significant figures based on the balance's calibration. Understanding how to interpret the readings from a digital balance, including recognizing the significance of each digit displayed, is vital for accurate mass determination in laboratory settings.