Question

Why are cooking vessels coloured black at the bottom?

Answer 1

Hint:Thermal properties are those of a material that is related to its heat conductivity. In other words, these are the properties that a material exhibits when heat is applied to it. Thermal properties are part of the larger topic of material physical properties.

Complete step by step solution:
When a material is exposed to heat fluctuation, its thermal properties determine how it reacts (excessive heat or very low heat, for example). The following are the major components of thermal properties:
Heat capacity: The amount of heat required to change the temperature of a material by one degree is known as the heat capacity of the material. The temperature is measured in Celsius or Kelvin, and the amount of heat is measured in joules or calories.
Thermal Expansion: When heat is applied to a material, it changes shape. When a material is heated, it expands. The term for this property of a material is thermal expansion. The area, volume, and shape of the material can all change.
Thermal conductivity: A material's ability to conduct heat through itself is known as thermal conductivity. High thermal conductivity materials conduct more heat than low thermal conductivity materials.
Thermal stress: Thermal stress is the stress that a body undergoes as a result of thermal expansion or contraction. It has the potential to be harmful because it can cause the material to explode.
The bottoms of the vessels are painted black so that when they are exposed to heat, they absorb it quickly because black is a good conductor of heat. This speeds up the cooking process. The upper part of the utensil is kept shiny to ensure that the utensil loses as little heat as possible while cooking. The fact that black objects absorb all wavelengths and are the hottest possible color contributes to their ability to conduct heat faster.

Note:
Since 9000 B.C., copper has been used in kitchenware. Copper cooking utensils are excellent heat conductors, as well as being hygienic, long-lasting, and corrosion-resistant. The heat conductivity of copper is 20 times that of stainless steel.