You have to keep the timing the same, and you have to keep the same amount of each thing the same.
constants.
The constants in an experiment is any factor that remains the same and does not change. These things are kept the same throughout each trial of the experiment.
control variable x
In an experiment, the parts that are kept the same are known as constants or controlled variables. These are the factors that are intentionally kept unchanged throughout the experiment to ensure that any observed changes in the results are caused by the independent variable being tested.
The factors that are kept the same throughout the experiment are called controlled parameters.
A variable that is kept constant in an experiment is called a controlled variable. This variable is deliberately kept the same throughout the experiment to ensure that any changes in the dependent variable are due to the changes in the independent variable.
A constant in an experiment is something that does not change, such as the temperature, pressure, or a control variable that is kept the same throughout the experiment to ensure accurate results.
The factors that are kept the same in an experiment are the constants.The factors that aren't kept the same in an experiment are the variables.
A controlled variable is the thing that is kept consistent in between trials of doing an experiment. e.g: time is kept the same or kept consistent...
The variable that stays the same in an experiment is called the control variable. It is kept constant throughout the experiment to ensure that any changes observed are due to the manipulated variable (independent variable) and not caused by other factors.
Constants are the things that are kept the same each time one of the trials in the experiment is repeated. For example, constants could include the amount of water used, the brand of effervescent tablet used, the type of water used, and the fact that the water was not stirred. As many outside factors as possible should be kept constant in an experiment so that the researcher can be sure that any changes that occur do so because of the independent variable.
Factors that are kept the same in an experiment are called constants.