Final answer:
The length of the object with dimensions 6.2 cm by 13.7 cm by 26.9 cm is 26.9 cm. A milliliter (mL) is a metric unit of volume that is equal to one cubic centimeter or 1/1,000 of a liter.
Step-by-step explanation:
The student has asked two separate questions which are related to measurement in mathematics. The first question is about identifying the length of an object given its dimensions, and the second question pertains to the capacity measurement in milliliters.
Object Length Identification
An object measures 6.2 cm×13.7 cm×26.9 cm. Among these dimensions, the longest one would typically be considered the length of the object. Therefore, the length of the object is 26.9 cm.
Understanding Milliliters
A milliliter (mL) is a unit of volume in the metric system. It is equivalent to one cubic centimeter or 1/1,000 of a liter. In terms of its size, one can imagine a cube that is 1 cm on each side, which will have a volume of 1 mL.