why do candles wax look clear when hot but not clear when cold?
594463
Let's see if I can handle this...candles are (mostly) made from petroleum-based materials that are prized for their ability to easily change from solid to liquid by the application of heat.  When solid, the molecular bonds of the material are so dense that they let little or no light pass between them, thus the "milky" appearance of the wax.  When heated, the molecular bonds of the material are so broken apart that they easily allow light to pass through and so appear "transparent."
671597
From personal observation I would say not always.  When ice is frozen for a long time it seems to lose its freshness.  It picks up odors and when defrosted doesn't smell or taste like fresh water. These things would indicate physical changes probably due to evaporation and perhaps osmosis.  Both of these occurrences would produce a change in quantity.
67967
Ice is not transparent; it's actually translucent. This means that the light photons don't pass right through the material in a direct path -- the material's particles change the light's direction. This happens because the distances between some atoms in the ice's molecular structure are close to the height of light wavelengths, which means the light photons will interact with the structures. The result is that the light photon's path is altered and it exits the ice in a different direction than it entered the ice. \n\nSnow is a whole bunch of individual ice crystals arranged together. When a light photon enters a layer of snow, it goes through an ice crystal on the top, which changes its direction slightly and sends it on to a new ice crystal, which does the same thing. Basically, all the crystals bounce the light all around so that it comes right back out of the snow pile. It does the same thing to all the different light frequencies, so all colors of light are bounced back out. The "color" of all the frequencies in the visible spectrum combined in equal measure is white, so this is the color we see in snow, while it is not the color we see in the individual ice crystals that form snow.
165350
wattage of the bulb is important...prob not generating enough heat to make the 'lava' flow (wax).\n\nIt should show signs of flow within an hour...at least!
189386
"Wood is a complex physical and chemical structure. Its overall elemental composition by mass is about 49% carbon, 6% hydrogen, and 0.2% nitrogen; the remaining elements and their amounts and forms vary considerably from one species of tree to another."  From the Source.\n\nThey want you to say that it is because oxygen is consumed when the match burns.  However, that is wrong.  When the match burns, C and H in the wood is burned to make CO2 and H2O.  CO2 is a gas with the same volume as the O2 from which it was created.  H2O is a gas with TWICE the volume as the O2 from which it was created.  However, the H2O condenses to a liquid that has negligible volume, hence, there is a volume loss.  Notice, though, that wood is only 6% H.  That means that the volume loss due to the creation of H2O is very small.\n\nAlmost all of the volume change occurs because you trap heated air when you put the glass over the burning match.  When the air cools, it contracts.\n\nYou can test this for yourself by rigging a glass with a snuffer inside.  Rig it so that when you put the glass over the match the candle is snuffed out.  Thus, no O2 in the glass is consumed.  The water level will rise as in the case without the snuffer.\n\n(Don't blow out the match then put the glass over it.  This will blow away the heated air that is trapped when you put the glass over a burning match.)
1120663
uh if you're having a problem with solvents in your wax use fire (it's amazing what you can do with those tealight candles and alcohol though it's not something you should do around flamable materials...)\n\nparaffin wax shouldn't dissolve in most conventional solvents.
8516
The heat of the flame melts the wax. The wick will transport liquid wax into the flame zone (by capillary action), where it can evaporate. The flame consists of two different zones, an oxygen-rich outer layer where carbon monoxide burns with a transparent blue flame and an oxygen-poor inner core where soot particles give off the warm orange glow of a candle flame.\n\nChemically, you have a reaction of the wax (esters of fatty acid) with the air oxygen, forming carbon dioxide and water, and depending on the quality of the wick, soot from incomplete combustion.
221941
your breath is warm compared to cold temperatures
60139
The colored piece of glass will absorb more light which will heat it up quicker.\n\nLight goes right through clear glass. Very little light/energy is absorbed.
153831
Pure quartz is clear and translucent, but natural quartz is typically tainted with impurities, and it takes on the color of those. Here are some examples:\n\n# Amethyst's color is due to an iron (ferric, Fe+3) impurity-induced color center\n# Citrine's color is due to an iron (ferrous, Fe+2) impurity-induced color center\n# Milky quartz's color is due to microscopic air, carbon dioxide, or water inclusions\n# Rose quartz's (crystalline) color is due to aluminum and phosphorus impurities - massive rose quartz's color is due to microscopic and, as yet, unidentified dumortierite-like fibers\n# Smoky quartz's color is due to an aluminum impurity-induced color center aided by natural irradiation
844878
Gases are more soluble in cold water than hot.  So if you take cold water from the faucet and freeze it, the ice will usually be cloudy.  If you heat it up first--or better yet, boil it--then freeze it quickly, without letting it sit around and absorb more gas,  the ice will be clear.
10447
The "white" is caused by the crystalization of water molecules when they are frozen.  Light refracts off these crystals in a full spectrum (so you get white.)  When the molecules free again after getting warm, the light no longer refracts off in the full spectrum removing the white color.\n\nBTW white light is made of millions of colors...
1173342
If its wax buildup you need to soften the wax and flush it out.  Something similar to this should help:
1003680
The lamp consists of an illuminating bulb, and a glass bottle containing a transparent liquid, translucent wax, and a metallic wire coil. The glass bottle sits on top of the bulb, which heats its contents. The metallic wire coil is hidden in the base of the lamp, which the glass bottle is sitting on.\n\nThe wax is slightly denser than the liquid at room temperature, and slightly less dense than the liquid under marginally warmer conditions. This happens because the wax expands more than the liquid when heated.\n\nThe light bulb heats the container at the bottom, and due to heat exchange with the atmosphere, the container eventually dissipates the introduced heat. This method of heat transfer is called convection.\n\nWax at the bottom heats until it melts, and eventually becomes less dense than the liquid above it. At this time, a portion of the wax rises towards the top of the container. Near the top, away from the heat source, the wax cools, contracts, and as its density increases it begins to fall through the liquid towards the bottom of the container again. The difference in temperature between the top and bottom of the globe is only a few degrees.\n\nOne mass of wax may rise as another falls. The metal coil at the bottom helps to overcome the surface tension of the individual wax droplets, causing the descending blobs to agglomerate into a single molten wax mass at the bottom of the container. The cycle of rising and falling wax droplets continues so long as the bottom of the container remains warm and the top of the container remains cool. Operating temperatures of lava lamps vary, but are normally around 60 °C (140 °F). If too low or too high a wattage bulb is used in the base, the "lava" ceases to circulate, either remaining quiescent at the bottom (too cold) or all rising to the top (too hot).\n\nChaotic behaviour makes the movement of the wax unpredictable—hence lava lamps can aid in the generation of one-time pads for cryptographic use.\n\nThe colour of the wax and the liquid often varies and can be found in many different combinations.
729423
It's colder outside, more wind and less humidity,less consumption of water and other liquids and of course the air inside is a lot drier and less humid because of heat. That's enough reasons for mine to be dry. Need a good moisturizing lip gloss. Chap stick doesn't really do it. Try a different brand.
404979
I think it is to do with the chemicals tht the companys use to add scent to candles. Have you ever lit anything that smells (like air freshener, deodorant)? Then you will see that it burns well. The candle is using those chemicles as fuel before    burning the wick. Also the dark one burnt qucker because of all the inks that are in it. Ink doesn't burn well so the colour is using more energy to burn itself.
455855
The temperature of the candle is measured in kelvin scale . it varies between 1800 to 1850 degrees kelvin.Zero Kelvin (not zero degree Kelvin) corresponds to -273.15 degrees Celsius, so ice melts at +273.15 K and water boils at +373.15 K.( 100 degrees celsius) .so in degrees celsius it would range from 1576.85 to 1526.85°celsius..hope this answers your question.