Name a pesticide found to remain a long time in the soil before it breaks down, causing problems in the food chain
What will be an ideal response?
DDT
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Men who came from ____________________ and Tennessee to settle Texas were the first of the American cowboys.
Fill in the blank(s) with the appropriate word(s).
The measure of the amount of water in the air compared to the maximum amount of water the air could hold at the same temperature and pressure is called the __________.
a. wet-bulb temperature b. dry-bulb temperature c. relative humidity d. dew point
Engineers shall not reveal facts, data or information without the prior consent of the client or employer except as authorized or required by law or this Code.
a. True b. False
The boiling temperature of nitrogen at atmospheric pressure at sea level (1?atm) is ??196°C. Therefore, nitrogen is commonly used in low-temperature scientific studies since the temperature of liquid nitrogen in a tank open to the atmosphere remains constant at ??196°C until the liquid nitrogen in the tank is depleted. Any heat transfer to the tank results in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198?kJ/kg and a density of 810 kg/m3 at 1 atm. Consider a 4-m-diameter spherical tank initially filled with liquid nitrogen at 1 atm and ??196°C. The tank is exposed to 20°C ambient air with a heat transfer coefficient of 25?W/m2•K. The temperature of the thin-shelled spherical tank is observed to be almost the same as the
temperature of the nitrogen inside. Disregarding any radiation heat exchange, determine the rate of evaporation of the liquid nitrogen in the tank as a result of the heat transfer from the ambient air.
What will be an ideal response?