a)Hydrogen has a much higher specific heat capacity than milk. What can you say about the specific heat capacity of hydrogen?b)wrap a cotton wool around a thermometer,will its temperature rise?Explain your answer c)if you are holding a metal nail with one of its end against a piece of ice,your hand soon becomes cold.Explain your observation.
a)One should state the basis of units for specific heat capacity. On the basis of kJ/kg-K, that statement is true. It means, for a kg of material, hydrogen will go up in temperature less than milk for a specific heat added.
a) Based on the statement that hydrogen has a much higher specific heat capacity than milk, we can say that the specific heat capacity of hydrogen is greater than that of milk. Specific heat capacity is the amount of heat required to raise the temperature of a substance by a certain amount. In this case, hydrogen requires more heat compared to milk to achieve the same rise in temperature.
To determine the specific heat capacity of hydrogen, you can refer to scientific databases, textbooks, or research publications that provide experimental or calculated values. The specific heat capacity of hydrogen is approximately 14.3 J/g·°C.
b) If you wrap a cotton wool around a thermometer, its temperature will not rise significantly. Cotton wool is a good insulator, which means it is a poor conductor of heat. Insulators do not transfer heat easily between objects, so they prevent or slow down the transfer of heat energy.
When you wrap the cotton wool around the thermometer, it forms a layer of insulation that limits the heat transfer from the surroundings to the thermometer. As a result, the temperature of the thermometer will not rise substantially.
c) When you hold a metal nail against a piece of ice, your hand soon becomes cold due to a process called conduction. Conduction is the transfer of heat energy between objects that are in direct contact with each other.
In this scenario, the metal nail conducts heat from your hand to the ice. Metal is a good conductor of heat, and it readily transfers heat energy. When you touch the nail to the ice, the heat from your hand is rapidly conducted through the nail and into the ice, causing your hand to lose heat and feel cold.
Additionally, the ice absorbs the heat energy from your hand, causing the ice to melt. This further enhances the sensation of coldness as your hand loses heat to the phase change process of melting ice.
It's important to note that metals have higher thermal conductivity compared to other materials, which is why they feel colder when touched due to their ability to conduct heat effectively.