Question

Explain the effects of heat

Answer 1

Exposure to more heat can cause health problems and may affect performance. As the temperature or heat burden increases, people may feel: Increased irritability. Loss of concentration and ability to do mental tasks

Answer 2

When a body is heated various types of physical and chemical changes are observed to take places, we list below some of the main EFFECTS OF THE HEAT :

• Physical Changes -------›

★ Change in temperate : We all know the addition or removal of the heat to or from a body brings about a change in the temperature edition of heat to a body usually raises its temperature, where as the removal of heat from body, lowest its temperature.

★ Change of State : Under appropriate conditions addition or removal of heat to or from a body can also bring about a change in its state. For example , on putting a tray of water in the freezer compartment of a refrigerator, the water freezes to form eyes and as we know that ice is a solid form of a water similarly when the water is heated over a flame it starts boiling and get converted into stream. Stream , as we know, is the gaseous or vapour form of the water.

★ Thermal expansion : Most of solid liquid and gaseous are known to expand on heating this phenomenon is called as thermal expansion. For example, the metal rim 2 to be put on a cart wheel is designed to have a slightly smaller diameter than that of the wheel. When give stream is heated it becomes red hot expands, and slips on the wheel easily . When it is cooled, it contracts and grips the wheel frimly.

• Chemical changes -------›

Many chemical changes takes place only when the reactants are heated up. For example we can prepare oxygen in laboratory by heating potassium chlorate along with magnesium oxide as a catalyst over a flame.