Question

Explain the Following Terms :(A)Calorific Valve (B)Green House Effect (C) Inflammable Substance (D) Ignition Temperature.

Answer 1

1. CALORIFIC VALUE: It is defined as “the total amount of heat liberated ,when a unit mass of fuel is burnt completely”
2. The greenhouse effect is a natural process that warms the Earth's surface. When the Sun's energy reaches the Earth's atmosphere, some of it is reflected back to space and the rest is absorbed and re-radiated by greenhouse gases. ... The absorbed energy warms the atmosphere and the surface of the Earth.
3. The substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances. Examples of inflammable substances are petrol, alcohol, Liquefied Petroleum Gas (LPG), etc.
4. The ignition temperature of a substance is the least temperature at which the substance starts combustion. Substances which spontaneously ignite in a normal atmosphere at naturally ambient temperatures are termed pyrophoric

Answer 2

Answer:

(A) Calorific Valve :- the energy contained in a fuel or food. (B) Green House Effect :- It is a natural process that warms a earth's surface. The absorbed energy warms the atmosphere and the surface of the earth. (C) Inflammable Substance :- The substances which have very low ignition temperature and can easily catch fire with flame. (D) Ignition Temperature :- it is of a substance is the least temperature at which the substance starts combustion.