Page 45 - Science class 4

FOOD PRESERVATION
The process of treating food in a way that preserves

it for a long time is called food preservation .
The food can be preserved by boiling the milk,

freezing the meat, dehydrating the vegetables,
salting the pickles, sweetening the jams, canning
the fruits and juices etc.

Quenching Scientific Thirst
Quenching Scientific Thirst
Quenching Scientific Thirst
Quenching Scientific Thirst
Quenching Scientific ThirstQuenching Scientific Thirst
Quenching Scientific Thirst
Quenching Scientific ThirstQuenching Scientific Thirst
Quenching Scientific Thirst
Quenching Scientific Thirst
Quenching Scientific Thirst
¤ If we uncoil our intestines, it would be nearly 33 feet long.
Food is very valuable, so we should not waste it.
Milk can be saved by pasteurization. Pasteurization is a process of heating
food, which is usually a liquid, to a specific temperature for a predefined length

of time and then immediately cooling it after it is removed from the heat.

Boiling the milk Salting the Pickles Dehydrating Canning the food

the vegetables
Strange but true

¤ Milk is a complete food. It contains, carbohydrates, minerals and even
fats except iron and vitamin C.

Sun drying method can also preserve food, e.g. : mint, coriander etc., are dried
for storage. Food can be freezed to a lower temperature for preservation, e.g. :

meat, milk, eggs etc., are kept in refrigerators.

Scientific Terms

Defecate : to get rid of the waste from the body
Energy : the ability to be very active
Flushed : the word used for cleaning a toilet seat with water

Left over : the remainder
Mashed : to mix or crush until it is soft
Pasteurization : to make free from bacteria by heating and cooling
Worn out : damaged by long or hard use