Because it Doesn't Want To.
food exposed to air and moisture gets spoilt easily . you will find brown green mould on food kept in the open for a long time.this is due to the presence germs in the air.Boiling-have you seen your mother boil milk? boiling kills the germs in it.so the milk can be stored for a long time.
Food should be preserved so that it doesn't get spoiled or rot. If it does get spoilt and we consume it, the bacteria in the rotten food can make us ill.
The microorganisms presents in the air come into the food and spoiles the food
how is food served
They usually give you two options to chose from for every lunch and dinner. One being a vegetarian meal. Food served on flights is mostly cooked from lesser oil, to keep it easily digestible, which helps. They serve fish, chicken, or beef along with rice or a bun. along with that they give you a beverage. If the flight is 10 hrs or more, then they serve various types of instant food like a cup of noodles, time to time in between meals.
The easiest way is to check the expiry date. If you think that the food tastes or smells different from normal, the food might be spoilt. If the colour has changed, or if there is fungus, bacteria growing on it, it might be spoilt.
Fresh food served from restaurant cars.
Planes well to send like South to the West may be food of mail.
Easily grown and requiring no machinery to process, corn served as the staple food crop in the fledgling colonial economy.
Yes, airlines typically serve food on planes, although the type and quality of food provided may vary depending on the airline and the length of the flight.
Bacterium, fungal spores in the air settle on the food infecting it. These microorganisms grow rapidly especially in warm damp dark conditions. If the food is eaten food poisoning can occur
Hot food steams when it is served because the heat causes the water in the food to evaporate, turning into steam. This steam rises and is visible as the food is served, creating the effect of steaming.