yes
The answer depends on what the numbers measure. If they are the masses of equal volumes of substances, then the substance with mass 0.8 is denser. On the other hand, if the numbers refer to the volumes of equal masses of two substances, then the substance with volume 0.7 is denser.
Not necessarily. Equal volumes do not always mean equal masses because different substances have different densities. Denser substances will have more mass in a given volume compared to less dense substances.
Take two hypothetically substances A and Bin equal masses (eg. 1 kg A and 1 kg B) and taken in equal volumes ( 0.8 L A, and 0.8 L B), then they already have the same density (both are 1.25 kg/L A and 1.25 kg/L B) each other apart. (that's how the question was formulated)HOWEVER:when mixed together the masses add up (Mass conservation law) to 2 kg A+B,BUT total volume is not exactly added up (no conservation law for volume). Normally some contraction takes place, then Vtotal < 1.6 L (sometimes more than 2% contraction)
A spoon is a measure of volume. Different substances have different densities so that the same volume of two substances can have very different masses.
Yes, two different substances with the same volume can have similar masses if their densities are similar. Density is the amount of mass per unit volume, so substances with similar densities will have similar masses for a given volume.
Not comparable - a liter is a unit of volume, a kilogram is a unit of mass. For specific substances, if you know the density, mass = volume times density.
Yes, two objects can have the same volume but different densities. Density is determined by the mass of an object per unit volume, so objects with different masses can have the same volume but different densities.
Density
Density is equal to the mass divided by the volume.
substances
substances
since density equal to mass/volume then mass=density times volume mathematically mass=density *volume