In school, jarrett learned that salt lowers the freezing point of water. he wants to test this in a home experiment.

jarrett adds 100 ml of water at 25°c into each of three identical containers. he then adds 0 g of salt to the first container, 25 g of salt to the second, and 50 g of salt to the third container.

which of the following is a constant in his experiment?

the amount of water
the type of container
the amount of salt
the starting temperature of the water