Smelling foods does not give it calories.
No.
one Calorie (or one kilocalorie) is equal to 1000 calories
Around 400
Yes
they are based upon a 2000 Calorie diet.
HI 100 gms of rice has a caloric value between 350 to 360 calories.
The Calorie (the upper case "C" is relevant) is an obsolete pre-SI Metric unit defined as the amount of heat required to raise one kilogram of water one degree Celcius. As this amount depends on the starting temperature, one Calorie (strictly speaking, a kilocalorie) varies in value (approximately4.2 Joules) and has only been specifically defined as a Thermochemical Calorie (4.184 J exactly). Calorie continues in use only as a unit of food energy. Technically, "calorie" (lower case "c") is a gram calorie with a value one-thousanth of a Calorie, however, the distinction is often not made. The word calorie derives from Latin, via French "calor" meaning heat.
smell
In terms of daily value 2000 calories is 100% of a 2000 calorie diet, and 80% of a 2500 calorie diet.
Calorific value. One calorie = 4.178 joule
Yes, it is a noun. It is a unit of energy, often expressed as heat, or as the energy value of food.
by burning it, and measuring the calories burned.