Variables

Independent variable
Experiment 1: Concentration of detergent in medium
Experiment 2: Temperature of medium
Experiment 3: pH of medium

Dependent variable
Amount of stain removed from fabric

Controlled variables
Experiment 1:
- Type of detergent used (SPINmatic!)
- Amount of water used in medium (100ml)
- Amount of stain applied on fabric (1/2 teaspoon)
- Type of stain used (Mixture of mustard, ketchup, coffee and egg)
- Temperature of the medium (Room temperature: 26 degree celcius)
- Time given for fabric to sit in detergent medium (Overnight)
- Size of fabric used (5cm x 5cm)
- Type of fabric used
- pH of medium (Neutral- pH of water)

Experiment 2:
- Type of detergent used (SPINmatic)
- Amount of water used in medium (100ml)
- Amount of detergent used in medium (1/2 teaspoon?)
- Amount of stain applied on fabric (1/2 teaspoon)
- Type of stain used (Mixture of mustard, ketchup, coffee and egg)
- Type of fabric used
- Size of fabric used (5cm x 5cm)
- Time given for fabric to sit in detergent medium (Overnight)
- pH of medium (Neutral- pH of water)

Experiment 3:
- Type of detergent used (SPINmatic)
- Amount of water used in medium (100ml)
- Temperature of medium (Room Temperature- About 26 degree celsius)
- Amount of detergent used in medium (1/2 teaspoon)
- Amount of stain applied on fabric (1/2 teaspoon)
- Type of stain used (Mixture of mustard, ketchup, coffee and egg)
- Type of fabric used
- Size of fabric used (5cm x 5cm)
- Time given for fabric to sit in detergent medium (Overnight)