Physics
Due to temperature variation along a conductor, potential variation occurs along it. This phenomenon is known as

Thomson effect
Joule effect
Seebeck effect
Peltier effect

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Physics
In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch?

To prevent the steam pressure from bursting open the pouch
To allow the aroma of the food to come out through the holes
To allow the heat to get into the food through the hole
To allow the microwaves to get into the food through the holes

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