Question 1.
During a class discussion on 'fuels for household Sarita suggested petrol. But her
teacher said it is not a safe fuel for household activity and asked her to sit. Sarita
wondered why petrol can't be used as a fuel for household activity though its
calorific value is high
Why petrol is not a safe fuel for household activity?
What fuels do we use in our houses?
What value of Sarita is shown here?
Answers
Answer:
known amount of the fuel is burned at constant pressure and under standard conditions (0°C and 1 bar) and the heat released is captured in a known mass of water in a calorimeter. If the initial and final temperatures of the water is measured, the energy released can be calculated using the equation
H = ΔT mCp
where H = heat energy absorbed (in J), ΔT = change in temperature (in °C), m = mass of water (in g), and Cp = specific heat capacity (4.18 J/g°C for water). The resulting energy value divided by grams of fuel burned gives the energy content (in J/g).
The combustion process generates water vapor and certain techniques may be used to recover the quantity of heat contained in this water vapor by condensing it.
Higher Calorific Value (= Gross Calorific Value - GCV = Higher Heating Value - HHV) - the water of combustion is entirely condensed and the heat contained in the water vapor is recovered
Lower Calorific Value (= Net Calorific Value - NCV = Lower Heating Value - LHV) - the products of combustion contains the water vapor and the heat in the water vapor is not recovered
Explanation:
Answer:
petroleum vaporizes/burns quickly so it is not safe
kerosene
curiosity and her interest in science