Final answer:
A buret is the most accurate for measuring 7 mL of liquid due to its ability to measure to the nearest 0.01 mL, offering both accuracy and precision over a graduated cylinder, which measures to the nearest 0.1 mL.
Step-by-step explanation:
If you were measuring about 7 mL of liquid, the most accurate measuring device would likely be a buret, as it permits volume measurements to the nearest 0.01 mL. While a graduated cylinder can be a useful tool for measuring liquid volumes, it typically allows for measurements to the nearest 0.1 mL.
For a volume of 7 mL, using a buret that allows for those finer divisions ensures both accuracy and precision, as the liquid's volume can be determined more exactly compared to the larger scale divisions of a graduated cylinder.
For a volume as small as 7 mL, a graduated cylinder would offer the most accurate measurement due to its fine scale and design that minimizes measurement errors.