Does anyone know the weight of a 400ml glass beaker?  Thanks?
959381
It will vary between different manufacturers. There will also be variation between similar beakers.\n\nYou need to measure the mass of the beaker in the lab, before you begin.
575510
I found a web site with a lab on how to figure out releative density of a given liquid hope it helps.  It has all the instructions and materials needed listed on the site
514815
OK, the barrel´s mass is 40Kg (notice: its mass is 40 Kg, not its weight). \n\na) So, your formula is Weight = mass(m)*gravity´s acceleration(g)= 40Kg*10m/s^2 = 400 KG*m/s^2 (=400 Newton)\n\nb) Work = force * distance\nSince work is calculated only for the vertical, and the force equals the weight, you have:\nWork = 400N*5m = 2000 Joule\n\nc) Eff = 250N*5m/2000J*100 = 0.625*100 = 62.5%\n(You got 12.5% because you forgot to multiply 250N for 5 meters. Remember that efficiency is a relation of works, and work is force * DISTANCE).\n;o)
77503
in a standard lab pipette it takes 20 drops approx. to make 1 ml....sooooo 1/20 of a ml
1124487
This is a link to some kind of government "Ask a Scientist" forum where a standard drop is identified as about .04ml. Convert to mc/cc.\nhttp://www.newton.dep.anl.gov/askasci/chem00/chem00578.htm
616026
No conversion is necessary.  36 ug/l equals 36 ng/ml, the ratio is the same!
127092
It would depend on the fluid that you are weighing.  Water for example is 1 g/mL at 20 degree Celcius. Other fluids with different densities will convert differently.
955187
1.4 grams or 1/20 of an ounce
677684
it depends on whether you are referring to13 oz as in weight  or 13 oz  as in fluid volume. If you mean weight then 369(rounded) is correct.  If you mean volume, then it depends on the density of theobject being measured.
217873
Measure concentration. Use a dummy (with water only) measuring that with a LabPro probe. Then compare that to a certain volume of a variable soft drink. I did this in high school, hope it works!
232453
480,000.0 mg /1000 = 480g, 0.80 L x 1000 = 800 ml, so 480g/800ml.  divide both sides by 800 = 0.6g/ml. m = milli = 1/1000. 1000 mL = 1 L, 1000 mg = 1g, 1000 meter = 1 kilo meter. Kilo = 1000.
513577
Don't mind the other smart ars*es - the answer is three stone, four kilograms and sixteen ounces.  I tested it twice and can guarantee the answer.
649619
you mean litre?  32oz?
262943
32 fluid ounces.\n\nThe relationship between fluid ounces and "weight" ounces has to do with water. 16 fluid ounces of water, or 1 pint, weighs 16 "weight" ounces, or 1 pound. The words pound and pint come from the same root because of this. There's a saying that "A pint's a pound, the world around." to help you remember this.\n\nThere are 2 pints in a quart, so thats 2 x 16 fl. oz. or 32 fluid ounces.
1006390
You need to know the density of whatever it is you want to convert.  1 ml of water at 4 degrees C is has a mass of 1 g or 1000 mg.  To convert any other liquid you must multiply by the specific gravity or density.
785219
density of alcohol alone:\n520 - 88 = 432 g\n\n432g/500mL = 0.864 g/mL
606521
Try this:\n\nhttp://education.yahoo.com/reference/weights_and_measures/