Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water at 0°C
Density of the substance to the density of water
Density of the substance to the density of water at 4°C
Density of water at 4°C to the density of the substance

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

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