Hello there, I'm a seasoned expert in the field of physics and fluid dynamics, and I'm here to provide you with a comprehensive answer to your question regarding the weight of one gallon of oil.

Firstly, it's important to understand that the weight of a liquid can vary depending on several factors, including its density, the temperature, and the specific gravity of the substance. Density is a key factor in determining the weight of a liquid, as it is defined as mass per unit volume. The density of oil can vary depending on the type of oil and its purity. For instance, olive oil, which you've mentioned, has a slightly different density compared to other types of oil.

The average density of olive oil is approximately 0.91 grams per cubic centimeter (g/cm³), which is less than that of water (1 g/cm³). This is due to the fact that oil is less dense than water, which is why oil floats on water. To find the weight of one gallon of oil, we can use the formula:

\[ \text{Weight} = \text{Density} \times \text{Volume} \]

Since there are 128 fluid ounces in a gallon and 1 fluid ounce is equal to approximately 29.5735 milliliters, we can calculate the volume of one gallon of oil in milliliters:

\[ 1 \text{ gallon} = 128 \text{ fluid ounces} \times 29.5735 \text{ ml/fluid ounce} \]
\[ 1 \text{ gallon} = 3792.91 \text{ ml} \]

Now, converting the density of olive oil from g/cm³ to g/ml (since 1 g/cm³ = 1 g/ml), we can calculate the weight:

\[ \text{Weight of olive oil} = 0.91 \text{ g/ml} \times 3792.91 \text{ ml} \]
\[ \text{Weight of olive oil} = 3450.0281 \text{ g} \]

To convert grams to kilograms, we divide by 1000:

\[ \text{Weight of olive oil in kg} = \frac{3450.0281}{1000} \]
\[ \text{Weight of olive oil in kg} = 3.450028 \text{ kg} \]

So, one gallon of olive oil weighs approximately 3.45 kg.

It's also worth noting that the weight can be affected by temperature. As temperature increases, the density of a substance decreases, which means that at higher temperatures, the weight of the same volume of oil would be slightly less.

In the U.S., the oil industry professionals, as you've mentioned, often use metric units for bottle sizes but may refer to larger quantities in gallons. This is a reflection of the dual system of measurement used in the U.S., which combines both the U.S. customary units and the metric system.

To summarize, the weight of one gallon of oil, specifically olive oil, is approximately 3.45 kg, taking into account its average density and the volume of a gallon. This value can be subject to slight variations due to temperature and other factors.

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1 Gallon of Olive Oil weighs 7.6 Lbs or 3.45 Kg on average (depending on temperature). In the U.S., professionals in the olive oil business often refer to bottle size the same way the Europeans do, using metric numbers, with the exception of gallons.read more >>