Specifically I'm looking to answer the below question;
You can only weigh accurately to 1 mg on your balance, but you need to make a solution containing 128 microgram of penicillin per cm3. Suggest a way you can do this accurately.
To weigh mass accurately, use a calibrated scale or balance. Place the object on the scale and wait for the reading to stabilize. Ensure the scale is zeroed before weighing to account for any additional weight.
To weigh mass accurately using a balance scale, first make sure the scale is calibrated and zeroed. Place the object to be weighed on one side of the scale and add weights to the other side until the scale balances. Record the total weight displayed on the scale.
There are 1000 nanograms in a microgram. So you have to divide your answer by 1000. 100 nanograms is actually 0.1 micrograms.
a bubble weighs one milligram
Based on experiment done by someone for fun, 80 micrograms is two eyelashes - so one eyelash (on average) would be 40 micrograms. For comparison ten grains of sugar weigh around 750 micrograms, i.e. a single grain of sugar (on average) weighs 75 micrograms. Of course YMMV - but this should at least give you a rough number for estimation purposes.
A balance or scale with a precision of at least 0.01g would be suitable for weighing 5g of sugar accurately. This could be a digital balance or an analytical balance.
A grain of sand, a small paperclip, or a typical mosquito would each weigh around a milligram.
The spring balance was invented by Richard Salter, a British balance maker, in the 18th century. He patented the design in 1770, revolutionizing the way weights were measured and making it easier for people to weigh items accurately.
The average weight of a mite varies depending on the species, but most mites typically weigh between 0.1 to 1 milligram. Their small size and lightweight nature make them difficult to measure accurately. Despite their tiny mass, they can be numerous in their environments, impacting ecosystems and human activities.
weigh out 0.5 g of copper sulphate on a weighing balance. u can use weighing paper to weigh the substance.
One milligram, if the water is at 4 degrees Centigrade. At any other temperature, the water will weigh a bit less.
I think you are asking how much 1 Milligram of Magnesium weighs. If MG does not stand for Milligram I am sorry The correct answer as above is 1 Milligram or 1 mg