Substance Definition When you hear the term "substance," what comes to mind? You may think of a variety of things, such as water, glue, or even a mysterious sticky spot on the floor. In science, the term substa
Convection occurs when there is a difference in thermal energy in a liquid or a gas. The area with greater thermal energy causes an increase in temperature, or molecular kinetic energy. This causes the molecules to move faster and spread out, decreasing the density of the substance. As density...
(1981) Underlying mechanisms in substance abuse: Examples from research on smoking. Addictive Behaviors 6 , 187-196 Online publication date: 1-Jan-1981. /Pomerleau, 0. F. (1981). Underlying mechanisms in substance abuse: Examples from research on smoking. Ad&rive Behaviors, 6, 187-196....
The objective of the paper is to present the available methods of monitoring and to discuss possible differences in the assessment of the antibiotics treatment. Sales data are expressed as the average amount of substance per animal or kg live weight (e.g. population鈥恈orrected unit, PCU). ...
Pressure in a Liquid Pressure is a measure of the force per unit area. In a liquid substance, all of the liquid molecules are pressing against each other and creating aninternal pressure. You can imagine the walls of the container feeling this force per unit area as well, and if you were...
Rocks and minerals are often combined into one field of science and studied together, but they each have unique characteristics. Minerals are an inorganic substance that occurs naturally in the Earth, and each one has a consistent and individual set of physical properties like its crystalline struct...
When you see distilled water, it is a pure substance. That means that there are only water molecules in the liquid. A mixture would be a glass of water with other things dissolved inside, maybe one of those powders you like. Each of the substances in that glass keeps its own chemical ...
The science experiments below are all examples of physical change. While, at first, you might think a chemical reaction has occurred, all that fizzing action is a physical change! Dancing Raisins While it might appear that a chemical change is occurring, a new substance is not formed. The ca...
In chemistry, the liquid state is a state n which a substance's molecules can move more freely than they can in the solid state. However, they are not as mobile as in the gas state. What are the three properties of a liquid?
In science, a property is often used to describe the different characteristics of a substance. These various qualities may refer to the state of matter, mass, density, oxidation, conductivity, color, bonding, etc. It is important to recognize the unique properties each substance holds, as it ...