Density is mass per unit of volume. which pair of lab instruments would a student use to measure the density of seawater? a caliper and a flask a stopwatch and a beaker a balance and a graduated cylinder a meter stick and a temperature probe

A balance and a graduated cylinder.

Explanation:

Density is the  relationship between mass and volume of a substance, the formula is:

ρ

Where m is the substance mass, and v is the volume.

If a student wants to measure the density of seawater, he or she should use a Balance, to measure the mass of the sample. And then use a Graduated cylinder, is a volumetric instrument that allows to contain liquids and then measures the exact volume of the sample.

Once the student obtains the mass and the volume, he/she has to replace the data in the density formula and so obtain the density of seawater.