Relative density, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Does gravity depends on atmosphere ... With Uranus, its density is 4.3 times lower than Earth's while its radius is 4 times larger. The effects of gravity can depend upon both the size and the mass of a planet. Section 2: Gravity Surveying. If two solid planets have equal mass but one is made of iron and the other of rock, the iron planet will be smaller and denser. Share . What I'm getting here then is that gravity depends on mass, density and some sort of 'field' that permeates all of everything. Density of an object depends on the temperature. The acceleration due to gravity at the surface of the planet is equal to that at the surface of the earth. Why do you land on the ground when you jump up instead of floating off into space? Gravity is the gravitational pull that is invisible and cannot be touched or changed. Gravity is the force by which a planet or other body draws objects toward its center. If the radius of the earth is R and the radius of the planet is R ′. 4. As the density depends on temperature, the specific gravity depends on the temperatures to which the densities of the substance and the reference relate. The situation gets more complicated. Introduction. A more dense object of a given mass is smaller, so you can get closer to its centre of mass and experience a stronger gravitational force. So, knowing the surface gravity of Earth, and the radius of the Earth, we could only calculate it's total mass, and from that, the average density of the planet. 1 decade ago. Well yes, but actually no. Specific gravity is dependent on the temperature, and most of the values found in the literature refer to STP conditions. Density is defined as the mass per unit volume of a substance. Because an object displaces a certain volume of fluid (equal to the volume of the object), you must multiply by the fluid's density to determine the mass displaced, and thus the buoyant force (or weight loss). Answer Save. An increase or decrease in temperature causes the expansion or contraction, respectively, in the size of the object. 1 decade ago. List 2 may change from point to point does not depend on direction of projection remains constant depend on direction of projection View solution If R is the radius of the earth and g the acceleration due to gravity on the earth's surface, then mean density of the earth is: 4 years ago. However, a person standing on the Earth's surface feels less gravity when the elevation is higher. However, this doesn't mean that gravity depends on density, but solely on the mass. Specific gravity is a relative measure of density, since you are calculating the ratio of a density of an unknown substance to the density of a reference substance (usually water) at a specified temperature and pressure. This can be seen with Gauss's law for gravity. 8 Answers. As per Ideal Gas Law; PV = nRT. Buoyancy Depends On. Source(s): https://shrinkurl.im/a0LAJ. rlsejhm . Density is defined as mass per unit volume. 0 0. The gravitational force equation shows that clearly: As I said: gravity depends only on mass. Specific gravity for liquids is nearly always measured with respect to water at its densest (at 4 °C or 39.2 °F); for gases, the reference is air at room temperature (20 °C or 68 °F). The force of gravity keeps all of the planets in orbit around the sun. The densities of the different layers will not change the surface gravity (though it will affect how gravity varies within the planet) . Gravity does not depend on density. Gold Member. 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