The idea is show the effect that temperature has on the growth of bacteria.
Things Required:
Milk measuring cup (250 ml)
2 pint (500 ml) jars
Refrigerator
Directions:
Put a cup of milk in each jar. Close each jar. Place one jar in the refrigerator. Place the second jar in a warm place. Examine the milk in each jar once a day for 7 days.
This Is What Happens:
The warm milk has thick, white lumps in it and smells sour. The cold milk looks and smells like drinkable milk.
Science Behind It:
Warm temperatures promote the growth of bacteria that can cause food to spoil. Cooler temperatures slow down the growth of bacteria, but milk will eventually spoil if left in the refrigerator long enough. The bacteria are present and grow very slowly when cold, but they do grow.
