Variables

Independant variable
In order to investigate the concentration of salt and how it will affect the boiling point of water, I will start with changing the amounts of salt in the water. The thing I will manually change is the grams of salt, so this becomes the independant variable.

Dependent variable
In my experiment which is to prove the concentration of salt and how it will affect the boiling point of water. I am deciding to change the amounts of salt to put into the water and measure how long it will take for the water to boil with the different amounts of salt. I am also measuring the temperature of the water as it boils. Therefore, i will be measuring the temperature of the water, this becomes my dependent variable.


Controlled variable
In my experiment I will be manually changing the amount of salt in the solution of clear water. I will be measuring the temperature of the water as it starts to boil. In every test the heat on high, the total quantity of the solution, the thermometer used and the same saucepan for the water will remain the same.