Heat class 7 worksheet ncert | printable & worksheet

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Heat class 7 worksheet ncert | printable & worksheet

heat class 7. Download heat class 7 worksheet based on the latest ncert syllabus including MCQ questions on heat, long questions, define questions on the sea breeze and land breeze, fill in the blanks on heat, and more.

Points to remember.

 a reliable measure of the hotness of an object is its temperature. Temperature is measured by a device called a thermometer.

The thermometer that measures our body temperature is called a clinical

Thermometer A clinical thermometer reads temperature from 35°C to 42°C.

The normal temperature of the human body is 37°C. Note that the temperature is stated with its unit, remember The temperature of every person may not be 37°C.

 

The process by which heat is transferred from the hotter end to the colder end of an object is known as conduction. In solids, generally, heat is transferred by the process of conduction.

The materials that allow heat to pass through them easily are conductors of heat. For example, aluminum, iron, and copper.

The materials which do not allow heat to pass through them easily are poor conductors of heat such as plastic and wood. Poor conductors are known as insulators. The water and air are poor conductor of heat.

 

When water is heated, the water near the flame gets hot. Hot water rises up. The cold water from the sides moves down towards the source of heat. This water also gets hot and rises and water from the sides move down. This process continues till the whole water gets heated. This mode of heat transfer is known as convection.

 

The people living in coastal areas like Goa, Kochi etc experience an interesting phenomenon. During the day, the land gets heated faster than the water. The air over the land becomes hotter and rises up. The cooler air from the sea rushes in towards the land to take its place. The warm air from the land moves towards the sea to complete the cycle.The air from the sea is called the sea breeze.

To receive the cooler sea breeze, the windows of the houses in coastal areas are made to face the sea. At night it is exactly the reverse. The water cools down more slowly than the land. So, the cool air from the land moves towards the sea.

This is called the land breeze



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