PRACTICAL ON CALORIE IN OUR BODY

INTRODUCTION

Calories are units of energy. Various definitions exist but fall into two broad categories.

• The small calorie or gram calorie (symbol: cal) is the approximate amount of energy needed to raise the temperature of one gram of water by one degree Celsius at a pressure of one atmosphere.

• The large calorie or kilogram calorie (symbol: Cal), also known as the food calorie and similar names, is defined in terms of the kilogram rather than the gram. It is equal to 1000 small calories or 1 kilocalorie (symbol: kcal).                                                                     Although these units relate to the metric system all forms of the calorie were deemed obsolete in science after the SI system was adopted in the 1950s. The unit of energy in the International System of Units is the joule. One small calorie is approximately 4.2 joules (so one large calorie is about 4.2 kilojoules). The factor used to convert calories to joules at a given temperature is numerically equivalent to the specific heat capacity of water expressed in joules per kelvin per gram or per kilogram. The precise conversion factor depends on the definition adopted.

In spite of its non-official status, the large calorie is still widely used as a unit of food energy. The small calorie is also often used for measurements in chemistry, although the amounts involved are typically recorded in kilocalories.The calorie was first defined by Nicolas Clément in 1824 as a unit of heat energy, and entered French and English dictionaries between 1841 and 1867. The word comes from Latin calor meaning "heat".

DEFINATION

The energy needed to increase the temperature of a given mass of water by 1 °C depends on the atmospheric pressure and the starting temperature. Accordingly, several different precise definitions of the calorie have been used.

Because energy is defined via work, the SI unit for energy is the same as the unit of work – the joule (J), named in honor of James Prescott Joule and his experiments on the mechanical equivalent of heat. In slightly more fundamental terms, 1 joule is equal to 1 newton metre and, in terms of SI base units

An energy unit that is used in atomic physics, particle physics and high energy physics is the electronvolt (eV). One eV is equivalent to 1.60217653×10⁻¹⁹ J.

In spectroscopy the unit cm⁻¹ = 0.000123986 eV is used to represent energy since energy is inversely proportional to wavelength from the equation .

In discussions of energy production and consumption, the units barrel of oil equivalent and ton of oil equivalent are often used.

When discussing amounts of energy released in explosions or bolide impact events, the TNT equivalent unit is often used.

FORMULAE FOR MAN AND WOMEN TO FIND CALORIE

Male-[13.75xweight]+[5xheight]-[6.076xAge]+66

Female-[9.56xweight]+[1.85xheight]-[4.68xAge]=655

ABOUT MY DAILY NEEDS OF CALORIE

=[13.75x74]+[5x163.75]-[6.076x17]+66

=[1017.5]+[818.75]-[103.292]+66

=[1732.958]+66

=1795.958

=1796 calorie

SO,
       NOW I NEED 1796 CALORIE DAILY.