Matter comprises all substances that take up space and have mass, and it may exist as a solid, liquid, gas or plasma. Light and energy are not matter because they have no mass and do not occupy space.Know More
The molecules that make up a solid lie close together and are bound strongly to one another. Because of this, solids have a distinct shape of their own that is not dependent on a container. The molecular bonds of a liquid are weaker than those of a solid, meaning that liquids do not have fixed shape. A liquid takes the shape of its container, but it does not change in volume. Molecules in a gas are very weakly bound. Like liquids, gases take the shape of their container. However, gases also change volume, expanding to fill their entire container.
The fourth phase of matter is plasma. Plasmas exist only at the high temperatures and pressures of the sun or bolts of lightning. Plasmas occur as electrons tear away from atoms, leaving behind positive ions and free electrons. Most scientists consider plasmas to be fluids like liquids and gases. Substance are able to transition between the stages of matter given the application or removal of heat.Learn more about Physics
Because physics is the study of what matter is made up of and the forces that interact on objects, it is applicable to just about every area of everyday life. The interactions of time and force is one of the primary areas of physics and has several real world applications, including the use of airbags in motor vehicles and sports equipment.Full Answer >
Ask.com defines physics as "the branch of science that is mostly involved with properties of matter, energy and nature." Additionally, Ask lists the main topics explored in physics: mechanics, heat, light, sound, magnetism, electricity and the structure of atoms. Ask also defines the word physics, when used as a noun, as "the science that deals with matter, energy, motion and force."Full Answer >
A physicist asks fundamental questions about the interaction between matter and energy and then begins observation and experimentation to answer these questions. Many of the technological advances that humans have today are the results of a physicist's work.Full Answer >
In 1909, Rutherford's X-ray experiments shattered conventional wisdom when he discovered that electrons didn't occupy matter like evenly-distributed raisins in a pudding. However, Bohr found Rutherford's conclusions to be inaccurate and proposed the revolutionary idea that atoms behaved according to the laws of quantum physics.Full Answer >