The graph below shows the volume and the mass of four different substances at stp.
which of the four substances has the lowest density?
(1) a
(2) b
(3) c
(4) d

Density is defined as the ratio of mass to the volume at standard temperature and pressure. In the graph, substance D will have the lowest density.

Formula of Density:

In the given graph, the substances A, B, C, and D, are measured on the graph.

From the formula, it can be interpreted as density is inversely proportional to volume and directly proportional to the mass. The density will be decreased if volume is decreased, and also, if mass is increased, then density will be increased.

Reasons for incorrect answers:

Therefore, D has the lowest density.

To know more about density, refer to the following link:

link

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.