What is the most likely reason that the red liquid inside of a thermometer moves up when it is heated?
A.
The particles in the red liquid move faster and come together.
B.
The particles in the red liquid move faster and spread apart.
C.
The particles in the red liquid move slower and come together.
D.
The particles in the red liquid move slower and spread apart.
B. The particles in the red liquid move faster and spread apart.
When the thermometer is heated, the molecules in the red liquid gain kinetic energy and move faster, causing them to spread apart. This expansion of the liquid causes it to move up the narrow tube of the thermometer.