## HEAT 🔥 | Class 7 Science Sprint for Final Exams | Chapter 4 | NCERT / CBSE Class 7 Science | Vedantu

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HEAT Class 7 Science Chapter 4: In today’s Class 7 Science Sprint session in Chapter 4, we discuss HEAT. The aspirants are advised to watch the entire video lecture for a better understanding of this HEAT topic of CBSE class 7 science/ NCERT class 7 science. This session will mainly be around the most important topic of HEAT.

Meet Nabamita ma’am enlightens you with the topic of ‘HEAT’ in an effective way.

NCERT solutions class 7 science chapter 4 heat is provided in this session to help students of class 7 understand the concepts of Heat interactively. The NCERT solutions for class 7 science chapter 4 Heat is one of the most crucial chapters in class 7 science. Heat is a very basic topic that is necessary for the students to understand to score well in the exams and to face bigger challenges in the future.

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Two types of thermometer:
1- Clinical thermometer: Thermometer means to measure our body temperature is called clinical thermometer.
2- Laboratory thermometer.

The temperature of an object: It is the degree of hotness or coldness of an object.

Thermometer: It is a device that can be used to find out how hot an object is. In other words, we use a thermometer to measure the temperature of an object.

Temperature is the degree of change of temperature and can be measured using a thermometer or a calorimeter. It is a means of determining the internal energy contained within the system.

Measuring the temperature of an object using a thermometer:
– It is a device that is used to measure the body temperature of a person.
– The Mercury level in the thermometer rises up in the thread-like portion of the thermometer which therefore indicates the temperature of the body.
– The level of the Mercury can be measured by reading the scale given on the thermometer.
– The scale of the thermometer records the temperature in degree Celsius, generally, 35o C to 45o C, which is the range of human body temperature.
– On average, the temperature of the human body is around 37o C.
– The clinical thermometer has a small sharp curve (kink) present near the bulb. This prevents the Mercury level from falling down on its own in the thermometer.

Hot and Cold:
We can understand if an object is hot or cold by the sense of touch. However, it can trick us sometimes. Therefore, we use a thermometer.

The transfer of heat class 7:
– The flow of heat always takes place from and hot object to a cold object.
1- Conduction: The process of flow of heat from a hot object to a cold object is called Conduction. Some objects can conduct heat while others cannot.

2- Conductors: The objects that can allow the heat to flow through them are called Conductors. For Example, metals such as copper and aluminum.

3- Insulators: The objects that do not allow the flow of heat from them are called Insulators. For Example, Wood, and Plastic.

4- Convection: The transfer of heat in liquids and gases is called Convection. The molecules of the liquid or gases that are near the source of the heat get heated first. They become lighter due to the heat and move upwards. The colder particles being heavier take the place and this process continues until the whole liquid or the gas gets heated. That is why the area above the flame of a candle always feels hot but the area on the sides of the candle does not.

5- Radiation: It is a process of transfer of heat in the form of waves. For Example, the sun’s heat reaches the Earth’s surface through radiation. Every hot object radiates some heat into the environment. Hence, many times an object gets heated just by being near to a hot object.

Effect of heat class 7 are:
– Heat increase in temperature
– Heat expands a substance
– Heat changes the state
– Heat brings chemical change.
– Heat affects the living thing

Our goal in this session of ‘HEAT class 7′ is to introduce some of the interesting facts of HEAT that may be helpful for students in learning about class 7 science.

#heat #class7science #vedantu

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Thanks for watching this ‘HEAT’ class 7 science class!!! Hope you have enjoyed and learned about HEAT.

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