The question, as stated, cannot be answered sensibly. A millilitre is a measure of volume, with dimensions [L3]. A pound is a measure of mass, with dimensions [M]. The two measure different things and elementary dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
As a simple mental exercise consider a millilitre of air and of water. They will have very different masses.
Furthermore, a pound is not a measure of weight which is a force. The weight of an object depends on the force of gravity acting on its mass and, as everyone knows, a fully grown adult can have 0 weight when they are in space.
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mL usually doesn't represent weight. But, mL meansmilliliters, so the 500 mL flask would be 500 milliliters.
Quick answer: you can't. Longer answer: Milliliters are a unit of volume, and pounds are a unit of mass. If you knew the specific density of a particular substance (in grams/milliliter, or g/mL, you could then find out how much X mL of that substance would weigh in grams, and then convert from grams to pounds. But you can't convert from one type of measurement (volume) to another (mass/weight). Followup Questions: 1. How many grams are in a milliliter of water? 2. How much does 500 milliliters of water weigh (in pounds)?
None. A pound is a measure of weight whereas a ml is a measure of volume. The weight of 4500ml depends on the density of the substance.
Sorry, Wrong Units. Grains are weigh and mL (milliliters) are volume.