We are planning an experiment to find out whether the rate at which water freezes depends on the shape of it container. Identify the manipulated...

The manipulated variable, also called the independent variable, is the variable that an experimenter purposely changes. The responding variable, also called the dependent variable, is the condition that's expected to change as a result of altering the manipulated variable. The responding variable is what you measure to get results.

In your experiment the manipulated variable is the shape of the container and the responding variable is the time that it takes for the water to freeze. 

Controlled variables are conditions that you intentionally keep the same so that they don't affect the outcome. In this experiment you want to make sure that the shape of the container is the only difference affecting the results, so you will want to control for other variables. Some conditions that should be controlled are:

• volume of containers


• type of material containers are made of


• starting temperature of water


• temperature of freezer


• size of freezer (use the same freezer for all containers)


• location in freezer


• source of water


• cleanliness of containers (impurities affect freezing point)