For a jet with a 2 cm diameter, while surface tension still exists, its influence on the jet's overall behavior is relatively small compared to other forces, so it might not be significant in practical applications.

Defrosting is not commonly required in double-door refrigerators, especially in modern frost-free models, because they are equipped with an automatic defrost system. Here's why: 1. Frost-Free Technology Double-door refrigerators often come with frost-free or no-frost technology. These systems automatically prevent the build-up of ice or frost by circulating air through the freezer compartment and periodically heating the evaporator coils. This eliminates the need for manual defrosting, which is common in single-door refrigerators without this feature. 2. Separate Compartments Double-door refrigerators have separate compartments for the fridge and freezer, with their own doors. This separation reduces the transfer of moisture between the compartments, which reduces frost formation in the freezer. The automatic defrost system in these refrigerators handles any minor frost build-up. 3. Automatic Defrost Mechanism In frost-free double-door refrigerators, the defrost cycle is controlled by a timer, defrost heater, and a thermostat. These components work together to periodically melt any frost that forms on the evaporator coils, ensuring that frost doesn’t accumulate over time. So, manual defrosting is not needed because these refrigerators are designed to automatically manage frost build-up.

I purchase it from local market. Price near rs.100

There are two reasons In pure metals heat is transfer due to molecular collision and electrons While as in non metals heat is transfer due to kinetic energy of molecules.

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