When a bottle is filled with water and allowed to freeze, the bottle breaks because water expands as it freezes, exerting pressure on the walls of the bottle. This expansion exceeds the tensile strength of the bottle material, causing it ...
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A small space is left at the joint between two railway tracks because the metal expands when heated and contracts when cooled. This prevents the tracks from buckling in the heat or creating gaps in the cold, ensuring safe and ...
When the water on the surface of a lake is just about to freeze, the temperature of the water at the bottom of the lake will be 4°C. This is because water reaches its maximum density at 4°C and sinks ...
When water freezes due to cold in winter, fishes and other aquatic organisms can survive because only the upper layer of water freezes. This insulating ice layer keeps the water below from freezing, maintaining a habitable environment.
The method of transmission of heat includes conduction, convection, and radiation. Conduction occurs in solids, convection in fluids, and radiation through electromagnetic waves. Therefore, all three methods together describe how heat can be transmitted.
In conduction, particles of matter do not move on their own from one place to another. Instead, heat is transferred through direct contact between particles. The particles vibrate and transfer energy without significant movement.
Heat is primarily transferred in liquids and gases by convection. Convection involves the movement of fluid particles, carrying heat as they circulate. While conduction can occur to some extent, it is less efficient, and radiation plays a minor role.
The unit of heat is Degree Celsius. Degree Celsius is a unit of temperature, not heat. The other options (Calorie, Kilocalorie, Joule) are units used to measure heat or energy, while Degree Celsius measures temperature.
The SI unit of temperature is the kelvin (K). It is defined based on the triple point of water, where water exists in equilibrium as a solid, liquid, and vapor. The kelvin scale is an absolute temperature scale, with 0 ...
The reason for the temperature of water at the bottom of the waterfall being higher is – The kinetic energy of falling water is converted into heat. As water falls, its kinetic energy transforms into thermal energy due to friction ...