Invisible, weightless, a substance called a CALORIC FLUID
REJECTED! BY COUNT BENJAMIN THOMPSON RUMFORD
AMERICAN-BORN PHYSICIST
HEAT IS FROM THE FRICTION ALONE, SEEMED LIMITLESS AND NOT A SUBSTANCE
AFTER 40 YEARS
JAMES PRESCOTT JOULE
ENGLISH PHYSICIST
Proved that a measurable amount of mechanical energy could always be transformed into definite
amounts of heat. Heat must be just another form of energy
MILITARY EXPERT IN EUROPEAN COUNTRIES
SOURCES OF HEAT
NATURAL SOURCES
THE SUN
THE INTERIOR OF THE EARTH
ARTIFICIAL SOURCES
CHEMICAL ACTION
Fuels like coal, oil, kerosene, wood and
gasoline are burned
Used as artificial sources of heat
Body = furnace
Oxygen burns food = 370C
MECHANICAL ENERGY
Rubbing hands
Compress gases
Air is pumped into a basketball (cylinder of the pump and the needle become HOT)