Weight of water compared to it volume?

Question

I have always heard that 16 fluid oz of water would weigh 6oz. but when I recently weight 15.08 fl oz of water at room temperature on a digital scale it weighted 14.25 oz. Is there a reason for this or is my scale wrong. I measured the fluid volume with a lab beaker from a highschool science class, so it should be right. is their a common household article that has an exact weight so that I can prove my scale? like maybe a coin?

Update:

typo! 16 fl oz of water should weigh 16 0z

? · Accepted Answer

A fluid ounce is a unit of volume, not mass. If you have 16fl.oz. of water at room temperature, it should weigh about 16.9oz. The beaker containing the water has mass too though, so you need to account for that. You also have to account for inaccuracy in the beaker. Paralax will cause a slight error, and so will temperature.

When testing a scale, you're really supposed to use something with a known precision that is better than your scale can read. To test your scale, you should use calibration weights. Search for them on Amazon.  If you are using a scale that has a precision of 0.1g, you need to use test weights that are accurate to ±0.03g or so (one third the precision of the scale). Coins will not be precise enough for a 0.1g, because they get worn as they age and change hands. A US nickel is supposed to be 5.000g when it leaves the mint, but circulated nickels will weigh anywhere from 4.9g to 5.1g, so they aren't really good for testing scales that have a 0.1g precision.

If you insist on using water, you should measure the volume in ml. This is because 1ml of water at room temperature is approximately 1g (because the gram/kilogram was originally defined in terms of the volume of water). So, measure out 500ml of water, and it should weigh 500g. The more precisely you can measure the volume, the better. A syringe / pipette might be better than a beaker because they are more precise.

? · Answer

The buoyant drive is the burden of the mass of water didplaced when the object is placed within the water. If the thing fully sinks, this force is the weight of a volume of water equal to the volume of the object. If the thing partially sinks i.E. Only part of its quantity sinks, we hve to calculate the quantity of that phase to find the burden of an equal volume of water to search out the upthrust. The system density = mass/volume can be vital.

Caroline Miller · Answer

fluid and solid ounces are different
1 pint contains 16 fluid ounces
1 pint dry = 1.16 fluid pints
there is no standard conversion between weight and volume unless you know the density of the ingredient.
1 Slug/ft^3 = 515.363 kg/m^3 
The density of water is 1.94 slug/ft^3 or 1000 kg/m^3 (1 gr/cm^3)

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Weight of water compared to it volume?

3 Answers