Smell of (Cold) Water
1. First, you have to collect different samples of water from different watercourses.
2. Half-fill plastic bottles to using water samples from streams and close them well.
3. Shake the closed bottle for approximately 1/2 minute. Then open a bottle and smell at once.
4. Determine the intensity of smell with Ball’s odour intensity scale. Try to also determine the type of smell.
BALL | INTENSITY OF ODOR | DESCRIPTION |
0 | without odour | undetectable |
1 | very weak | odor is detected only by professional |
2 | weak | odor is detected if we are warned |
3 | perceptible | odor is easily detected |
4 | distinct, prominent | odor draws attention |
5 | very strong | odor drives away |