Which receptors tells us whether an object is light or heavy?
81249
Predominately touch and pressure receptors in the skin (in this case on the hand) provide feedback about the weight (and texture) of an object.\nIf a heavy object is picked up then other receptors are involved to a greater extent. These are the stretch receptors in the muscles.
573389
it's reactive to light
286308
As such the smallest unit of weight is nanogram, but weight is a relative term that differs from one place to other depending on the gravitational force. Scientifically, mass is an important thing. The smallest unit to measure mass is "atomic unit" or au.\nIf u get a candy, for this answer, rate it as the best. :)
96297
Weight is the force acting downwards and support is the force which is acting upwards (A.K.A Normal Force). In most cases if the support does not undergo buckling or breaking when weight is applied, their magniture will be the same.\nMag of Weight = Mag of Normal force.\n\nBut the difference is they act on different objects. i.e. weight acts on the supporting plane and the normal force acts on the object that is put on the support.\n\n-->  p  <--\n\nDanEelectrician@yahoo.com
441007
Lighty is an electromagnetic ray that gives the sensation of sight.Electromagnetic waves are waves that donot need any material medium for their propogation.\n\n\nWhen a light falls on a polished surface like mirror reflection occures and this phenominon is called reflection\n\nWhen a light falls on a transparent substance like water  and glass it passes throuhg that medium and this phenominon is called refraction\n\nMagnification is the ratio of the size of the image to the size of the object
51910
Weight is a force, but when something is weighed you actually measure it's mass assuming you are in an environment in which the force of gravity is constant (i.e., you're at a fixed location <radius from the center> on a planet or massive planetary mass).\n\nof course, one's mass can be approximated by W=mg at fixed radii from such planetary masses (like the earth, a massive asteroid, a superdense star, whatever...) if the force of gravity, g, is known at that radius.\n\nThere are 2 possible variables here - mass and the force of gravity.  Which one do you know?  usually an approximation for g is given.  Which one do you measure, then...that would be mass.
15257
Weight is defined as the force of attration b/w the earth and the object.\nAs we know that the force is defined as:\nF=m*a    (Force = mass * acceleration)\n\nIn our case, this force is the wieght of the body and the acceleration is the acceleration due to gracity i.e g. So the formula becomes:\n\nw = m*g
922837
light, (in the perspective you are talking about) would be, more specifically- visible light.  This light in particular consists of a specific range of of vibrational frequency.  (dont know the range off hand) now, set that aside for a moment.  OKay. Now, through a process known as evolution (inhereted change in dna over time) moleculres began to form in ways that were able to carry out very specific functions. this continues until you have cells and then cells aquire specific functions.....nervous systems develope and with the a nerve cell that responds and is stimulated (specifically) by the particlar wave frequency of visible light(mentioned earlier) now, the visible light spectrum is like the key ( the receptor being the lock) and it activates the cell which then sens an action potential (depolarization) of the cellular membrane at what is known as the site of excitation.  at this site, ion channels open and + charged sodium ions are transported into the cell axon where there is the reversal of the net negative charge.  (keep in mind this is all on the one cell being stimulated) this reversal of the charged is the action potential.  By reversing the charge it has a gradient-like affect which causes an electrical current which travels the length of the axon to what is known as the "terminal buttons" which then enscribe the elctrical message into a chemical message; known as a neurotransmitter , which is then sent across a fluid filled gap between this cell(transmitting neuron or pre synaptic neuron) and the recieving neuron or post synaptic neuron.  The gap is known as the synaptic cleft.  This neurotransmitter is accepted by a form of endocytosis by the recieving neuron and the process continues till the message reaches the brain. here, it gets very detailed and very complex and requires the reading of books not message bored summaries.
298529
If you know the density of the material, you can measure it's volume.  D = M / V.  Therefore, the mass equals the density of the object times the volume.  The weight of the material is its mass times gravity.
594590
The word "heavier" implies the weight of the object....a force.  Weight is the force acting on a mass due to gravity.\n\nEither you have changed the wording of the statement so much so that it has changed the meaning or that is one poorly written "phisiks buk" [physics book].  If you are indeed quoting out of the book, throw that peice of trash out the window now.\n\nWhat you are probably refering to is the Earth's density versus the density of a neutron.\n\nThe density of a Neutron star (which is made up of only neutrons) is about 3 E14 g/cm^3.\nThe Earth has an average density of about 5520 kg/m^3, or about 5.52 g/cm^3.  You can see the drastic difference in densities.\n\nIf you said you had a "test tube full of bare neutrons" and that test tube has a volume of...50 mL, it would have a mass of 1.5 E13 kg.  The Earth has a mass of about 5.97 E24 kg.  Clearly the Earth is more massive, and thus under the same gravitational field, "heavier".
619847
The answer is Breath\n\n...EDIT...\n\nWhat about LIGHT.
42452
Tell them that the mass is the actual ammount of stuff(matter) in a given object.  Weight is the force of gravity pulling on the stuff (mass or object).  The gravity is caused by the ammount of mass in the other object.  So on earth it has a constant mass so the ammount gravity on an object is constant.  Therefore on earth we can measure the mass of an object using its weight.
455075
The sensory receptors for the eye is the retina and optic nerve, specifically cones and rods in the retina, for the nose it is the olfactory nerves
48658
Yes, smells have weight, or mass. When you smell something, your nose is detecting a few, a very few, molecules floating around in the air.
506096
Rods rod, since color is limited at night the rods become more sensitive to light and they are the neurons doing most of the firing at night.
67475
Our eyes react to different shades of light, and what we determine as colors\nare different wavelengths of light.  When we say an object is a certain\ncolor, it is because it is reflecting more of a certain wavelength light.\nFor example red objects reflect "red" light, or light with a longer\nwavelength (lower frequency) better than other types of light.\n\nSo, we determine the color by the primary type of light the object reflects\n(or emits if it is a light).\n\nWe also perceive other properties of colors, and that is lightness or\ndarkness.  A light colored object may reflect one color especially well, but\nalso reflect other colors as well.  A very light green object, for example,\nreflects green very well, but also reflects most other colors, just not as\nwell.\n\nDark objects tend not to reflect light very well at all, even if it reflects\none color better than the other.\n\nWhite objects, tend to reflect all types of light equally well, and tend to\nreflect most of the light cast on it.\n\n\n\nBlack absorbs-white reflects, that is why.
229380
It will weigh things that are suspended in air or water. It was invented by Newton.