Physics
Mercury is commonly used as a thermometric fluid rather than water because

specific heat of mercury is more than water
density of mercury is more than the water
specific heat of mercury is less than water
mercury has greater visibility than water

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

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