unit of measure is the milliliter mL When measuring volume
Last updated: 1/30/2023
unit of measure is the milliliter mL When measuring volume in a Meniscus graduated cylinder pipet or buret place it on a flat surface and view the height of the liquid in the cylinder with your eyes directly level with the liquid see example at right This prevents making parallax reading errors The liquid will tend to curve downward due to superficial tension i e the curved interface between air and liquid This curve is called the meniscus Always read the measurement at the bottom of the meniscus The graduated cylinder will usually have larger markings that are numbered There are smaller markings in between the larger units called graduations not necessarily numbered as shown in the figure The number of graduations between numbered markings determines the least count It is important to determine the least count before you start measuring To find the least count subtract the values of any two adjacent labeled graduations and divide by the number of intervals between them For example a Subtract the values of two adjacent labeled graduations 15 mL 10 mL 5 mL b Divide the previous number by the number of intervals between the two adjacent labeled graduations 5 mL 5 1 mL Therefore each graduation i e the least count of the cylinder is 1 mL ME 3113 Laboratory Assignment 1 Measurement Devices Page 3 There are three graduated cylinders shown in the picture at right The graduated cylinder on the far left has scale markings that are 0 1 mL apart so it can be read to the nearest 0 1 mL Hence we can estimate a volume of 5 75 ml 0 05 ml note that 0 05 mL in 5 75 mL constitutes the estimated digit and 0 05 mL is the uncertainty which was calculated as half of the smallest division of the scale of the measurement device 0 1 mL 2 0 05 mL Based on this example what is the measurement of volume in the center and rightmost graduated cylinders shown in the picture assuming each scale is in ml 10 points Center cylinder volume 10 points Rightmost cylinder volume 15