How to Take Measurements of Length, Mass, Volume, and Temperature

When measuring length using a scaled instrument like a meter stick, it's crucial to record the measurement one significant figure beyond the instrument's precision. For a meter stick precise to the tenth of a centimeter, the measurement must be estimated to the hundredths place. Examples demonstrate how to identify certain digits and estimate the last significant figure.

For mass measurements using a triple beam balance, similar rules apply. If the balance is precise to the tenth of a gram, the final measurement should include an estimated hundredths place. Several examples illustrate how to read a triple beam balance, combining the values from different beams and estimating the last digit.

Measuring volume with a graduated cylinder also requires recording one significant figure beyond the instrument's precision. The video explains how to determine a graduated cylinder's increments (e.g., 1 ml, 0.1 ml, 0.2 ml, 0.5 ml) and how this affects the final measurement. It also highlights the importance of reading from the bottom of the meniscus. A special rule for 0.5 ml increments is mentioned, where the measurement is taken only to the tenths place to avoid estimating two significant figures.

The video demonstrates how to use the water displacement method to find the volume of irregular-shaped objects like screws or rocks. This involves measuring the initial volume of water in a graduated cylinder, adding the object, and then measuring the final volume. The difference between the final and initial volumes gives the object's volume. It also notes that 1 ml is equivalent to 1 cubic centimeter for solid objects and emphasizes significant figure rules in subtraction.

Temperature measurement with a thermometer follows rules similar to volume. First, determine the thermometer's graduation (e.g., 1°C increments). The reading is then recorded with one estimated significant figure beyond the level of precision. Examples illustrate reading temperatures from Celsius and Kelvin thermometers, including negative temperatures, and the necessity of adding a zero for precision when the reading falls exactly on a mark.