(d) Calorie,
(g) Convection
(e) Radiation
(h) Sea Breeze
(1) Condu
(i) Land
meter.
Differentiate between :
1. Heat and Temperature
2. Boiling point and Melting point
3. Land breeze and Sea breeze
4. Calorie and Joule
5. Conductors and Insulators
of the bottle.
Explain, giving reasons :
2.
3. We use clothes for holding hot vessels in the kitchen.
4. Cooking utensils are made of metals.
5. Handle of tea pot is made of plastic or wood.
Answer the following questions:
1. What is the difference between heat and temperatur
2. What is the direction of effects of the transfer of he
3. What is the principle of thermometer? Why isme
ipes in hills are covered with fel
Answers
Answer:
Specific Heat and Latent Heat
Specific heat: = energy required to change a unit mass of a material by 1°C. Units: energy per unit mass per degree.
Latent heat = energy required to change the state (gas, liquid, solid) of a unit mass of material. Units: energy per unit mass.
Both specific heat and latent heat are properties of a given material. In other words, every time the material is heated/cooled, no matter how quickly or by what heating process, the same amount of heat is transferred to reach the same state.
Change in energy of a substance:
To raise/lower its temperature:
DE = CpM DT
To change its state:
DE = LM
where
DE = change in energy
DT = temperature change
M = mass
Cp = specific heat
L = latent heat
Energy must be added
to increase the temperature
to melt it
to evaporate it
Energy is released when a substance
cools
condenses
freezes
Energy units:
Ergs (1 erg = 1 g cm2 s-2)
Joules (1 J = 1 kg m2 s-2 = 107 ergs)
Calories (1 cal = 4.184 J)
Answer:
Definition
1. What is Calorie?
Answer:-The energy needed to raise the temperature of 1 gram of water through 1 °C (now usually defined as 4.1868 joules).
The energy needed to raise the temperature of 1 kilogram of water through 1 °C, equal to one thousand small calories and often used to measure the energy value of foods.
2. What is Convection?
Answer:- The movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
3. What is radiation?
Answer:-According to physics,
The emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization.
According to Biology,
Divergence out from a central point, in particular evolution from an ancestral animal or plant group into a variety of new forms.
4. What is Breeze?
Answer:- A breeze blowing towards the land from the sea, especially during the day owing to the relative warmth of the land.
Differentiate between:-
1. Differentiate between Heat and Temperature?
Answer:- The core difference is that heat deals with thermal energy, whereas temperature is more concerned with molecular kinetic energy. Heat is the transfer of thermal energy, whereas temperature is a property the object exhibits.
2. Differentiate between Boiling point and Melting point?
Answer:- The main difference between boiling point and melting point is that the melting point is defined as the temperature at which solid and liquid phases are in equilibrium, whereas the boiling point is the temperature at which the vapour pressure of a liquid is equal to the external pressure.
3. Differentiate between land breeze and sea breeze?
Answer:- Land breeze blows during the night from land to sea and the land becomes cooler faster than the sea. The air above the sea becomes less dense (i.e. warmer) and rises. The cooler air from the land moves in to take its place. Sea breeze: Sea breeze blows during the day and the land heats up faster than the sea.
4. Differentiate between calorie and juole?
Answer:- The calorie was originally defined as the amount of heat required at a pressure of 1 standard atmosphere to raise the temperature of 1 gram of water 1° Celsius. ... Since 1925 this calorie has been defined in terms of the joule, the definition since 1948 being that one calorie is equal to approximately 4.2 joules.
5. Differentiate between Conductor and Insulators?
Answer:- The conductor and insulator are the types of material. One of the major difference between the conductor and insulator is that the conductor allows the energy (i.e., current or heat ) to pass through it, whereas the insulator does not allow the energy to pass through it.
Explain with giving reasons:-
1. We use clothes for holding hot vessels in the kitchen.
Answer:- Cotton thermal properties are better than other available items of clothing in-house. Cotton is a good insulator of heat, minimizing any destructive heat accumulation. As a result, they can withstand hot ironing temperatures.
2. Cooking utensils are made of metals.
Answer:- The 'Cooking utensils' are mostly made by metals because; They are very 'good conductors' of heat and helps food to cook faster. They are highly heat resistant and can withstand heat while cooking without melting or softening of the metal .
3.Handle of teapot is made up of wood or plastic.
Answer:- Cooking pots are provided with wooden or plastic handles because they are bad conductors of heat. This prevents the heat from the pan to transfer to our hand. Thus, we can hold the utensils comfortably by our hands.
Answer of following questions:-
1. What is the effect of heat transfer?
Answer:- The basic effect of heat transfer is that the particles of one substance collide with the particles of another substance. The more energetic substance will typically lose internal energy (i.e. "cool down") while the less energetic substance will gain internal energy.
2. What is the principle of thermometer?
Answer:- These liquid thermometers are based on the principal of thermal expansion. When a substance gets hotter, it expands to a greater volume. Nearly all substances exhibit this behavior of thermal expansion. It is the basis of the design and operation of thermometers.
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