How to Measure Gas Volume in a Syringe Accurately

Measuring Gas Volume

To measure the volume of gas or liquid accurately, you need to align the meniscus level with the closest graduation mark on the syringe. Estimate it to the nearest 0.5 mL or one-tenth of the smallest scale division.

Estimation Process: When measuring the volume of gas in a syringe, you should observe the level of gas and match it with the nearest graduation mark on the syringe. If the mark falls between two graduations, estimate to the nearest 0.5 mL or as accurate as possible. Always consider the precision of the measuring equipment.

For Liquid Measurement: When using a graduated cylinder for liquid volume measurement, observe the meniscus level between marked graduations. Estimate to the nearest 0.5 mL or as finely as possible. Use the bottom of the meniscus for the most accurate reading.

Precision Notes: For precise measurements with a buret, you can measure to finer increments, such as 0.01 mL. When using a syringe or graduated cylinder with divisions of 1 mL, estimate to the nearest 0.1 mL, one-tenth of the smallest scale division.

Example: If the meniscus level in a graduated cylinder is between the 21 and 22 mL markings, and halfway between the two marks, report the volume as 21.5 mL.