Riya noticed that ice cubes kept in a steel bowl melted faster than those kept in a plastic bowl. She wanted to know why this happened. She placed equal-sized ice cubes in both bowls under the same conditions and observed the time taken for them to melt.
Identify the variable that Riya kept the same during the investigation.
Model Answer
Riya kept several variables the same, including the size of the ice cubes and the environmental conditions (e.g., temperature, location) under which both bowls were placed. These are controlled variables.
Explanation
Riya kept the size of the ice cubes and the environmental conditions (e.g., temperature, location) the same as controlled variables.