Does the temperature of things affect its weight, will something weigh more hot or cold?
360041
The temperature of an object is a measure of the average internal kinetic energy of an object as a system of particles, and as a result an object that is much hotter than another object will have negligibly more inertial mass than a colder object. This is due to Einstein's equation relating total energy and inertial mass of an object. The difference is so negligible as to be invisible, as the factor of proportionality is the square of the speed of light in vacuum. See the source for details.
17452
Hot air is less dense than cold air, assuming that volume is held constant, because the molecules in the heated air move more and faster than in cold air.  Think about a room filled with people.  If the people move around quickly (as molecules in heated air), then the people will spread out more and make more room between eachother (which would be lower density).  Since the hot air is less dense, and more dense objects are "more affected" by gravity, then the warm air is "lighter".
752935
Mass is a fundamental quality. No matter where something is, it has the same mass. Weight, on the other hand, is the force that gravity exerts on the mass. Though in standard units we measure both in pounds, technically mass is measured in pounds mass, while weight is measured in pounds force. In SI units, mass is measured in grams, and weight in newtons.\n\nTo answer your question, weight will change with distance from the earth's center. Mass will not.
436928
If the Earth's radius were bigger, and the mass of it stayed the same, then you would weigh lighter.  That's because with a bigger radius, you're farther away from the centre of gravity, therefore less pull.  If the mass change, then the situation would be different.
142406
Mass is not affected by temperature, but volume can be slightly changed because if an object heats up, the particles begin to move faster and so it expands, or vice versa if the object gets cooler.
2830
To nitpick (we all love to do that) very accurate weight measurements (for example in a lab) must be taken in a total vacuum or otherwise compensated for the bouyancy of air.  For example how much does a hot air balloon weigh?  It depends on whether it is cold on the ground or hot in the air; where it would have negative weight.  So a pound of feathers weighs the same as a pound of bricks if weighed in a vacuum because their densities (weight per volume) are greatly different.  But only you know if this was a trick question.  Good luck.
1134140
Depends on the thermoconductive properties of a certain material. Copper for example will heat up or cool down very fast.
1136596
1. Someone said heat rises - not true. Warm air is lighter than cold air, so warm air rises. The evaporator of the fridge being on top will give a more even 'cold' distribution. If the evaporator was on the bottom, the bottom of the fridge would always be colder than the top.\n2. Cold air is heavier than warm air. If the freezer is open on top, the cold air will not escape. If the freezer is upright, with no doors, the freezer will lose all of it's 'cold' air, it will spill out of the freezer.\n3. Radiation\n4. Pit vipers have an infrared sensor. It picks up the heat generated by the rat's body heat, in the form of radiation.\n5. speed of light.
1052987
All of the above.\n\nActually even Magnetism is affected by heat.  Heat a magnet and it will lose its magnetism.\n\nChemical composition will also change.
43355
When an object is hot, it heats the air around it.  These air currents that result give whatever you're weighing a buoyancy effect.  The warm air actually supports some of the weight the hot object, so the mass that the balance reads is artificially low.
423947
Yes it would weigh the same. The air contained in the can would only change the weight if it was pressurized. Otherwise the air pressure would be consistant with the atmospheric pressure in the room.\n\nSmashing the can would only change the weight of the can if you smashed it so much that you pulversied it into oblivion
87856
It all depends on the definition of what we call as weight.  Generally weight is defined as the force equal to the product of mass and acceleration due to gravity. By this definition the weight of an object is the same irrespective of its surrounding medium.\n\nBut often we deal with problems when an object is surrounded by some medium say air or water.\n\nIn that case we have to say that the weight in air or weight in water.\n\nBy ‘weight in air’ we mean the net force (weight in vacuum minus the upward force due to air)\n\nBy ‘weight in water’ we mean the net force (weight in vacuum minus the upward force due to water)\n\nTherefore,\n The weight in vacuum will be greater than the weight in air. \nThe weight in air will be greater than the weight in water.\n\nIf nothing is added (surrounded) to the term weight, \nWeight means weight in vacuum\n\nAnd is the same whether it is in air or water.
791190
Only if E=MC^2\n\n... it follows that if there is a change in the rest-energy of a body, there must be a corresponding change in its rest-mass. For example, if a body is heated, and thereby absorbs a small amount of energy ΔE (as measured in the frame of reference in which the body is at rest), its rest-mass will increase by a very small amount equal to ΔE/c2. This increase is tiny because of the high numerical value of the speed of light. Indeed, for mid-sized objects, such an increase in mass would be too small to measure with even the most accurate balance. For example, if a 1 kg block of gold is heated so that its temperature increases by 10 °C, then, ceteris paribus, its mass would increase by as much as 1.4 × 10-14 kg; a cube of gold of this additional tiny mass would have sides smaller than one one-thousandths of a millimeter. Similarly, if a body emits an amount of energy ΔE, say in the form of light or heat, its rest-mass will decrease by a tiny amount ΔE/c2. In both cases, the important and novel claim made by SR is that the inertial mass of a body can change depending on whether it absorbs or emits energy. This is true, of course, not just for isolated mid-sized objects but for any physical system.
473273
temperature will rise depending on starting temperature, albedo(reflectivity), density, and probably lots of other factors, so there is no set answer.
588958
the weight will be according 2 density of the material \n\nfor example for water 1  liter wighs 1 kg
581085
There are many effects that pressure has on human physiology from nitrogen narcosis, inert gas saturation of tissues, and even disbaricosteonecrosis. You could write a book and still not fully explain the effects of pressure on a human and indeed many have been written. But your question regarding water is a very simple one. Water is incompressible. Therefore no mater how great the pressure is the density and thus the weight do not change. There is one effect that might make it seem like the water is heavier though. Water has a predictable yet subtle thermal expansion patteren. Typically the deeper one goes, the colder the ocean is. Water is densest around 35 degrees Fahrenheit. So we can say that cold water is hevier than warm water, but not a whole lot.
714524
Well,  Hot & Cold are not only subjective (What's Hot for he is cold for me) and relative.  Better to think of temperature.\n\nTemperature is the measure of average kinetic energy.  The hotter, the more energy and vice versa.  \n\nAlso, as temperature is an average, some of the "hot" water may be cold.  In fact, there could be a several molecules that are frozen - we'd never know - but the average temperature is "hot."\n\nWhen you mix them heat is transfered from the high average kinetic energy water, "Hot," to the low average kinetic energy water, "Cold."  The "Cold" water absorbs the heat in the transfer and the results is as follows...\n\nThe "Hot" water is cooled, and the "Cold" water is warmed.  The results is 24 oz's of water that has an average kinetic energy, or temperature, higher than that of the "Cold" water, and lower than that of the "Hot."