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Understand: thermal energy and equilibrium

Problem

In 1654, Ferdinando II de’ Medici created the first sealed-bulb thermometer to measure temperature. Bulb thermometers rely on the consistent expansion and contraction of liquid trapped inside the device.
A museum photograph showing a rack of de-medici thermometers. Each glass tube ends in a sealed glass ball.
A rack of de’ Medici thermometers
Complete the statement.
Temperature is a measure of the ______.
Choose 1 answer: