how would density of a metal be affected if it were wet
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How long germs can survive on metal can vary greatly. It would depend on the type of metal, the type of germ, and if the metal is wet or dry. On average, germs can last years in many cases.
the metal is a conducting metal and when this touches water it becomes the second conductor and so it sends an electrical surge to what ever is touching the water (you!).
The weight of 1 liter of sand can vary depending on the type of sand and its moisture content. On average, dry sand has a density of about 1.6 grams per cubic centimeter. Therefore, 1 liter of dry sand would weigh approximately 1.6 kilograms, or 1600 grams. However, if the sand is wet, its density would be higher, resulting in a heavier weight for the same volume.
It is a guide strip. If you were using wet ink or someting like that the ink would smear without the medal guide. With the metal guide it allows you to follow th rulers edge without contacting the ruler where it meets the paper. If the ink touched both the ruler and paper at exactly the same time you would have smears.
Ice expands as it warms. At 4 degrees C water achieves it's maximum density. Warm ice is less dense than cold ice. Any amount of liquid water would mean that the ice has gotten as warm as it can get and that it is in equilibrium with the liquid water. The ice, being crystalline, has a discreet melting point so it is either water or it is warm ice. If the ice is wet, it is less dense than ice that is cold enough that the water in contact with it freezes. That doesn't mean that warm ice must be wet ice. If the water is removed, the dry ice will be the same density as the wet ice of the same temperature. Having said that, it is possible that you want to contrast the density of frozen carbon dioxide to water ice. * Water ice has a density of 0.92 g/ml * Dry ice (CO2) has a density range from 1.4 to 1.6 g/ml