![]() M 3 and with the following dimensions: length of 25 M/s 2), which is an average value of 9.81įind the mass and weight of a block of wood with a density of 720 The force (in Newtons) will be produced by a mass (in kilograms) that is subject to the acceleration created by the Earth's gravitational attraction (in The value of the weight of a body or substance can be found using the formula However, in theory, this distinction is very important. The weight of a body or substance should thus be expressed in Newtons, which is rarely the case in practice. ), the force exerted on a mass that is subject to the Earth's gravitational attraction is expressed in a Newtons. ), the weight of a body or substance will vary according to its location, but its mass will always remain the same. Since gravitational attraction is variable (it is lower at higher altitudes than at sea level, the Moon's gravitational attraction is weaker than the Earth's, The force exerted by this mass when it is subject to the Earth's gravitational attraction is the weight of the body or substance. The mass will not change if the body is placed on the moon, the top of a mountain or at sea level. The mass of a body or a substance is a value that represents the quantity of matter of the body or substance. A distinction must be made between the mass and the weight of a body. Mass and weight: The term "mass" (with its unit, the kilogram) is used regularly right from the start of this text. Steel = 7.5 (variable depending on its composition).The value of specific gravity is shown without units.Ī few examples of the specific gravities of liquids:Ī few examples of the specific gravities of solids: Note that no units follow the transformation of density into specific gravity. The specific gravity of a substance is always the Specific gravity is defined as the ratio of the density of a substance to the density of pure water (1,000 Specific gravity is an expression that simplifies the use of density. The density of wood turpentine can be 650īodies with a density lower than that of water will float, whereas the others will sink., then 1 cubic metre of steel has a mass of 7.43 metric tonnes. Steel has a density (depending on its composition) of about 7,430.Saltwater has a mean density considered to be 1,025.This means that one cubic metre of pure water has a mass of 1,000 Liquids, solids and gases all have their own density. The standardized unit of volume is the cubic metre (ĭensity is a property that is unique to each type of matter. They are also useful for finding the volume occupied by a given mass of liquid or solid.ĭensity is the mass of a substance (expressed in The notions of density and specific gravity (or relative density) are very useful for finding the mass of a known volume of solid or liquid. Density, specific gravity, mass and weight
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