what is energy?
ability to do work
what does food scientists examine? what does it help?
how heat is transferred during cooking and preservation and how energy affects the structure of food during such processes. --help develop new food products to meet the needs of consumers
how can energy be describe?
stored or motion
what is potential energy?
stored energy. e.g. work done in lifting objects to a position. in food, it is in the form of chemical potential energy called calories.
what is kinetic energy?
the energy of motion. the faster an object moves, the more kinetic energy it has.
what energy does atoms and molecules always have?
kinetic energy, because they are always in motion.
how does energy constantly change?
from potential to kinetic energy and back again.
how can Potential and kinetic energy be described?
as external or internal.
what is external energy?
Energy applied to an object by another source
what is internal energy?
Energy within an object
what does food contain?
internal potential energy--fuel for the body is stored in every piece of food.
what is energy's property?
versatile多用途的 and can change from one form to another.
what forms of energy are used by the food industry?
all forms. mechanical, chemical, electrical, nuclear, radiant.
what is mechanical energy?
total kinetic and potential energy of a system.
what is mechanical energy used by?
the body whenever it moves. equipment during food processing.
what energy does mixers, blenders and food processors convert to?
electrical energy to mechanical energy.-- performs work on food.
when is chemical energy generate?
bonds between atoms are forms or broken during chemical reactions.
what does endothermic reaction do?
absorbs or stores energy and lowers the temperature
what does exothermic reaction do?
releases energy and increases the temperature
what does metabolism do?
allow body to utilize chemical energy from food.
how does electrical energy produce?
movement of e-
what can electrical energy do?
efficiently converted into mechanical or radiant energy for food processing. transported through materials that are good conductors such copper, silver, and certain metals.
what is radiant energy?
energy transmitted in the form of waves through space or some medium.--electromagnetic spectrum is another term.
what will it call when visible?
when radiant energy is used?
cooking appliances and outdoor grills.
what energy does microwave change?
convert electrical energy to radiant energy. the electron tube converts electrical energy into microwaves
what is magnetron?
the electron tube.
what is microwaves?
low-frequency electromagnetic waves of radiant energy
how does microwave work?
interior surfaces reflect microwaves toward the food.
what does induction cooktops use electromagnetic waves do?
generate heat during cooking.--special pans with metals that react to a magnetic field produce the electric current needed to cook food