The reason the mass did not change because he did not add anything to the mixture accept the two liquids and its not possble to change the mass/ weight of any certain weighted item like the which is heavier the 1 pound of feathers or the 1 pound of bricks the only things is that the brick has more density so there for neither one is heavier than the other because the are both a pound
What subject is this again ? If I know now then I would have a better understanding of what I’m gonna answer so you don’t get it wrong !
Think about your question you literally just asked. If the person is a non-English speaker than from where they come from it may mean something totally different to them than it does to us. It could also demonstrate a totally different way of saying the word as well.
1.98 g/ml=1980 kg/m3 because 1 kg =1000g, 1m3=1000.000mL
The human retina can only detect incident light that falls in waves 400 to 720 nanometers long, so we can't see microwave or ultraviolet wavelengths. This also applies to infrared lights which has wavelengths longer than visible and shorter than microwaves, thus it is invisible to the human eye.