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.

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Identify the type of laboratory glassware or instrument being used for the measurement (e.g., graduated cylinder, burette, pipette, digital balance).

For glassware, ensure you are at eye level with the meniscus to avoid parallax error and read the measurement from the bottom of the meniscus.

Determine the smallest scale division on the glassware to understand the precision of the measurement. This will help you decide the number of significant figures.

For digital balances, record the measurement as displayed, since digital instruments are designed to show the correct number of significant figures.

Count the number of significant figures based on the precision of the measurement tool: all non-zero digits are significant, zeros between significant figures are significant, and trailing zeros in a decimal number are significant.

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주요 개념

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Significant Figures

Significant figures are the digits in a measurement that carry meaningful information about 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 and ensuring that calculations reflect the precision of the data.

Meniscus Reading

The meniscus is the curve seen at the surface of a liquid in a container, such as a graduated cylinder. When measuring liquid volumes, it is important to read the measurement at the bottom of the meniscus to ensure accuracy. This practice accounts for the surface tension of the liquid and provides a consistent method for obtaining precise volume readings.

Digital Balance Precision

Digital balances are instruments used to measure mass with high precision, often displaying results to a specific number of significant figures based on their calibration. The precision of a digital balance is determined by its design and the quality of its components, which affects how finely it can measure mass. Understanding the limitations and capabilities of a digital balance is essential for obtaining reliable mass measurements in laboratory settings.