Does rust make an object heavier or lighter?
408591
When iron turns to rust, the resulting rust is heavier than the original object.
472017
Rust is an oxygenation reaction- \nBleach is a strong oxidizing agent, and thus will cause rust\nPowder bleach won't do anything in the absence of at least some water, because there is no medium for the reaction to occure\nAbsolutely pure water without dissolved oxygen will not speed rust, but it always has dissoved oxygen, and thus acts as a faster medium than air to speed rust\nMineral lime in water is a fast ruster\nVinegar is a reducing agent, and will prevent rust, but it'll eat the iron away.
1030054
You would find, if you had a sensitive enough measuring system, that the energy is dispersed through the acid as heat. \n\nWhen acid oxidises metal there is an initial activation energy required to break the metal lattice and that energy nromally comes from the heat already in the system. When the lattice is under stress sit requires far less energy to break down and the activation energy is lower. That means that more heat is retained by the system as heat.\n\nYou can see for yourself that a metal lattice under stress breaks down and oxidises more readily by simply bending an iron nail and dropping it in a few mm of salt water for a few days. The iron will rust almost exclusively where it was bent. That is because the  bend represents a point of stress in the lattice.\n\nWith less energy required to break down the metal alttice the overall reaction becomes more energetically positive and the amount of heat in the system increases.\n\nThe amount of additional heat this represents is tiny, but with an incredibly stable atmosphere and a very sensitive thermometer you would regeister the lost energy as a higher temperature than an identical beaker of acid with an uncompressed spring.
49589
In some cases it is because of weight.
709561
An object has mass regardless of gravity.  Gravity gives us 'weight' by placing force on the mass.\n\nSo, strictly speaking, an object's "mass" is a measure of how much matter it contains.  An object's "weight" is a measure of gravity's effect on that object.\n\nSo an object's mass doesn't change if it is on a different planet, but its weight will.
788009
163 lb (solid) but only 87 lb if pulverized
566264
It has all to do with the law of floatation.\n\nA piece of metal will sink to the bottom of a tank of water because its weight is GREATER than the weight of an equal volume of water. \n\nLikewise, a piece of wood or plastic will float because its weight is LESS than the weight of an equal volume of water.\n\nA ship may weight tonnes. However, its overall weight IS LESS THAN the weight of an equal volume of water.\n\nIf you are able to measure the total volume of the ship, you will find that the WEIGHT INSIDE this volume IS LESS than the weight of an equal volume of water.\n\nSo the ship can float.
87902
salt doesnt have as much effect on rust.... where rust comes from is oxygen reacting with the iron in your vehicle....\n\nso when water (H20) comes in contact with iron (Fe) it creates iron oxide...rust(FeO2)
386364
actually, stainless steel can corrode.  There are different grades of stainless based on the amount of nickle, chrome and other additives that protect it from oxidizing, however, if those additives are in too small amounts (as in low grade stainless), it can rust.  It'll still be slower than regular steel but it is not in vincible.
161906
how heavy is your magazine?
101463
that depends on the material's specific gravity\nweight in kg = specific gravity * volume in ltrs
1053942
depends on the type of metal
770625
I'm sorry, i have to correct some of the misunderstandings posted above here.\n\nTHE WEIGHT DOES NOT, I REPEAT, DOES NOT CHANGE IN WATER.   weight is a term in physics for the interaction of gravitational forces on a masseous object.  Does the mass of the object change in water?  NO.  Does the mass of the earth change when an object enters water?  NO.  Therefore the weight is the same.\n\nWhy do objects feel lighter in water?  the difference in net force is the answer.  Weight still pulls down equally... However, the water creates a boyent force which counteracts a percentage of the weight (depending on the object submerged.  roughly counteracts 40% for humans, different for other objects).  In this way, while the weight is the same, the downward force of the object is less.  That's the confusion point for almost everyone who's answered so far.
492642
Darkness\nEdit*\nAnd if you put it in a can it weighs less...\nA hole
1008022
No i've got a metal screw holding my lower orbit together(eye socket)it's made out of titanium or something similar so it wont rust.
889129
yea, but probably not the right weight
165380
they would be almost the same weight, however mild steel should be slightly heavyer