A cargo of 10,000 barrels of gasoline is loaded at a temperature of 90°F, and a cargo temperature of 55°F, is expected on this voyage. It has a coefficient of expansion of .0006. How many barrels would you expect to discharge at your destination?
• Thermal expansion/contraction of liquids and how temperature change affects volume • The formula: Volume change = Original volume × Coefficient of expansion × Temperature change • Converting temperature difference in °F directly into the formula (no need to convert to °C for this type of exam question)
• First, decide whether the cargo volume will increase or decrease when cooling from 90°F to 55°F, and by about what percentage • Calculate the total volume change using the given coefficient and temperature difference, then subtract or add this to the original volume • Compare your calculated discharge volume to the answer choices and see which is closest to your computed value
• Be sure you are using the temperature difference (ΔT), not the actual temperatures, in the formula • Confirm whether the coefficient .0006 is applied per degree Fahrenheit in this problem’s context • Double-check if you should add or subtract the volume change from 10,000 barrels based on whether the cargo is cooling or heating
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