What do scientists use to measure energy in food?

Answer 1

although not most accuratethe simplest way to test the energy content of foods is using a calorimeter, this is basically a insulated copper beaker filled with water. the item of food is burned under the copper cup. the change in temperature of the water is then taken. using the specific heat of water and copper it is possible to find how many joules of energy were added to the water and beaker. this value can then be converted into calories if desired

Answer 2

A calorie is the amount of energy required to raise a volume of water a certain amount. This historically was determined by completely burning food surrounded by water.

The Atwater system averages the components of food to determine a calorie count, because our bodies do not derive energy from certain types of food. In this system protein and carbohydrates add 4 kilocalories per gram to a food's total, whereas fat adds 9 kilocalories per gram.

Answer 3

Energy is measured in joules,but it is sucha small amount of energy thatkilojoules(=1000 joules) is more commonly used.

Specifically for food, the old-fashioned unit Calories,is still in use. But that too is a fairly small amount, so what you'll usually see isKilocalories, or Kcal instead.

The SI unit for energy is joule, but food energy is sometimes still measured in the old unit, calories. Note that when they say "Calories" (usually spelled with an uppercase "C"), actually they usually mean "kilocalories" (thousands of calories).

Answer 4

It is measured in food calories or kilocalories, (kcal)

A kilocalorie = 1000 calories of heat.

A bomb calorimeter is used to determine the heat content of foodstuffs.

A representative sample of food is collected and 1 gram is placed in the calorimeter, the bomb is then filled with oxygen and placed in a vessel holding a measured amount of water. The sample is then burned in the bomb and the heat transferred to the water is measured, giving the total amount of heat released, in calories. This is then divided by 1000 to get food calories or kcals.

Answer 5

Generally by burning the food inside of a calorimeter, which is a device that measures how much heat is produced. The number of calories of heat equals the number of calories (or chemical energy) in the food.

Answer 6

They light it on fire and hold it under a test tube of water, they measure how much the water has heated up since it was on fire. They do some calculation and that's how they find out

Answer 7

Bomb calorimeter.

Answer 8

a bomb calorimeter.

Answer 9

the instrument is caloricmeter

Answer 10

by calories