Question

define vein and calorfic value​

Answer 1

Answer:

Veins are blood vessels that carry blood towards the heart. ... Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart. In contrast to veins, arteries carry blood away from the heart.

3.11 Calorific value. Calorific value is the amount of energy released or produced when 1 kg of fuel burns or any other substance is burnt in the presence of oxygen and the products of combustion are cooled to STP. Its SI unit is kJ/kg.

Answer 2

Answer:

veins are blood vessels that carry blood towards the heart. most veins Carry deoxygenated blood from the tissues back to the heart , exceptions are the pulmonary and umbilical veins,both of which carry oxygenated blood to the heart.in contract to veins, arteries carry blood away from the heart.

calorific value is the amount of heat energy present in food or fuel and which is determined by the complete combustion of specified quantity at constant pressure and in normal Conditionds. it is also called calorific power.the unit of calorific value is kilojoule per kilogram