Consider the following physical cases. Choose the letter that correctly matches each roman numeral with the appropriate heat transport mechanism. ⦁ A young boy who jumps into a swimming pool feels cooler than the surroundings. ⦁ On a freezing day, a gas station attendant finds the metal handle to a gasoline pump intolerably cold to grip. ⦁ A camper gets warm in from of a campfire. ⦁ I. Convection II. Conduction III. Radiation ⦁ I. Conduction II. Radiation III. Convection ⦁ I. Radiation II. Convection III. Conduction ⦁ I. Conduction II. Convection III. Radiation ⦁ I. Radiation II. Conduction II. Convection
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
⦁ Consider the following physical cases. Choose the letter that correctly matches each roman numeral with the appropriate heat transport mechanism.
⦁ A young boy who jumps into a swimming pool feels cooler than the surroundings.
⦁ On a freezing day, a gas station attendant finds the metal handle to a gasoline pump intolerably cold to grip.
⦁ A camper gets warm in from of a campfire.
⦁ I.
⦁ I. Conduction II. Radiation III. Convection
⦁ I. Radiation II. Convection III. Conduction
⦁ I. Conduction II. Convection III. Radiation
⦁ I. Radiation II. Conduction II. Convection
The correct answer is
I Convection II conduction. III Radiation
Here we are looking at the means of heat transfer due to which the pool gets colder than the surrounding. Basically the pool water gets cold due to convection of heat transfer from atmosphere. As the specific capacity of water is more than air so it losses the heat slowly. During night when temp goes down due to convection current the pool gets cold.
Then the second case when the metal handle of gasoline pump becomes very cold that is because of conduction as the metal handle is directly in contact with the cold air. As the specific heat capacity of the metal is more than air so it losses the temperature slowly.
The camper gets warm due to campfire is due to radiation. Here the heat which enters the camper due to radiation is not able to escape due to closed area so heat is retained inside.
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