Is it true that energy has mass?

Answer 1

No, energy does not have weight: energetic mass does. Energy is "the ability to perform work:" it is therefore not an object or a tangible real-world thing. When physicists talk about energy, they are talking about a quantity: the amount of work a system can perform.

Answer 2

Energy and MassOR, put another way, "does mass have energy"? The answer to both is, "YES". Einstein related the two in his famous equation, E=mc(2). This is the basis for nuclear and thermonuclear reactions in which a small amount of the mass of an element is converted into energy. The relative amounts of mass and energy (radiation) (radiation is only one form of energy) in the universe were fixed in the first moments after the Big Bang, the creation of the universe over 13 billion years ago.

Note: That's just a theory, but today there are many new theories that contradict this in that they postulate that new Universes are being created and destroyed constantly, on a universe sized time scale. These universes can also collide so "new" matter/energy CAN be introduced in to our universe. Think black holes and white holes. Black holes suck matter/energy from our universe and white holes spit it out into new universes. So in essense the "big bang" was really just a white hole and every black hole in our universe is creating a new universe somewhere else. Or so that one theory goes.

False Statement: Under ordinary circumstances, there is no free interconversion of mass and energy. These events can occur only in the environment of tremendous heat and pressure which exists in a star, or, momentarily, in the detonation of a nuclear device.

That statement is completely false but I kept it to demonstrate how poorly the common man understands this concept. You yourself are converting energy to mass and mass to energy at this very moment. Any warm blooded being with some intellect should be able to figure that out.

A simple concept, is a good old fashioned fire in the fireplace. Wood burning turns to heat and light. Wood has more weight before being burned and there's not as much weight left in the ash, true there is some weight lost to out-gassing but it is negligible. So if, Weight equals mass times (the acceleration of) gravity and the weight of ash is less than wood with gravity being a constant, wouldn't you conclude that energy has mass.

Answer 3

No. Usually energy cannot have mass. Forms of energy such as light, heat, sound do not have mass. But energy can become mass. In the investigation of cosmic rays they have discovered that some reactions take place where energy becomes particles. They have discovered that a certain amount of gamma rays gets converted into two particles. The two particles that get created from energy are electron and positron which have a definite mass. When an electron and a positron-they are antiparticles to each other-combine their mass disappears and in its place a certain amount of energy appears. This process is known as annihilation.

Answer 4

Well, an electric current consists of moving charge carriers (usually electrons). And moving objects have increased kinetic energy, which according to Einstein's E = mc2 means they also have increased mass. In this way you can attribute a mass to electricity.

Answer 5

Easy answer: No. While potential and kinetic energy are posessed by objects with mass, the energy itself is not a physical object, and thus cannot have any physical properties: Location, length, density, or mass (etc).

The other answer: Yesss.... ish. According to Eistein's only famous equation, mass and energy are related. A body which gains enough energy (Kinetic. Potential energy is extremely subjective, and doesn't really count.) may have a measureable increase in mass, equal to the energy divided by the speed of light squared. However, this effect is absolutely negligable in any regular, day-to-day calculations. Unless something is travelling at almost the speed of light, or you are calculating atomic reactions, don't worry about it.

Answer 6

Energy is converted to mass every time your car takes you across town. As the car accelerates from its relative speed of zero, it gains mass because is gains kinetic energy (and gives up mass as it slows and loses kinetic energy). The amount of gain is so tiny at driving speeds as to be unmeasurable, but there is a gain in mass any time any mass is accelerated. At speeds approaching the speed of light, the mass gain is much more appreciable. You can calculate the amount of gain by manipulating the equation E=mc2: m=E/c2. Since c2 in the denominator is such an enormous number, you can see that the amount of mass gained for relatively small increases in kinetic energies will be very tiny.

Answer 7

Yes, by the formula E = mc2, just divide the energy by c2. In SI units, divide the energy (in Joules) by (300,000,000 m/s)2. That is, divide by 9 x 1016 m2/s2. Result will be in kilograms.

Answer 8

no because

Answer 9

Yes.