What is Powder: Definition and 85 Discussions

A powder is a dry, bulk solid composed of many very fine particles that may flow freely when shaken or tilted. Powders are a special sub-class of granular materials, although the terms powder and granular are sometimes used to distinguish separate classes of material. In particular, powders refer to those granular materials that have the finer grain sizes, and that therefore have a greater tendency to form clumps when flowing. Granulars refers to the coarser granular materials that do not tend to form clumps except when wet.

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  1. I

    Relative Density of metal powder

    How can I determine relative density of solids in powdered form? or in other word... How do you determine relative density of metal powder... Thank you..
  2. D

    Dutasteride powder dissolved in ethanol/vodka for topical

    Hi there! Hopefully someone is here who could help me with this! For a project I want to make a topical of a hairloss medicine. It's about Dutasteride. Dutasteride is soluble in ethanol (44 mg / mL), methanol (64 mg / mL) and polyethylene glycol 400 (3 mg / mL), but insoluble in water. For...
  3. J

    Tungsten coated molybdenum powder

    Hello Everybody, I would greatly appreciated your help. I have been working this problems for the past couple hours and can't seem to find the answer. I tried Google, and opening up my old textbooks but to no avail. I could really use some help. I have sample of tungsten coated...
  4. E

    Will Press Fit and Powder Coat Work Together for My Sheet Metal Part?

    Hello all, I need some help with a sheet metal part I am going to produce. The part consists of 12ga A572 grade 50 sheet metal and a 1020 or 1018 steel spacer that will be press fitted into a laser cut hole in the sheet metal. After assembly the part will be powder coated where I know...
  5. M

    Investigating the Motion of Floating Particles in Escaping Powder Experiments

    I am doing experiment about escaping powder. In this experiment I am immersing hot wire into the water and investigating the motion of floating particles. What is the importance of thickness of wire? And what do you think about other parameters?
  6. M

    Phosphor Powder for solar cells

    someone just asked this as a comment on an article i was reading http://home.howstuffworks.com/fluorescent-lamp6.htm 'Does a phosphor powder give off a photon or electron when struck by light?' I was just thinking maybe a solar cell made of phosphor powder to emit electrons. I...
  7. K

    Calculate the surface area of 1 g of TiO2 powder

    Homework Statement Calculate the surface area of 1g of powder with a size of 100micrometer. Assume the particles are spherical. Then estimate the percentage of TiO2 molecules at the surface of the particle (relative to the total number of TiO2 molecules in the volume of the particle) for the...
  8. F

    Instrument or method to analyze Si and SiO2 powder

    Hii... I have a powder that consists of Si, SiO2, Fe3O4, FeO and Fe. I really want to measure the conversion of Si to SiO2. Anybody know what kind of instrument or method that can be used to measure the composition?
  9. H

    Is MgO Powder Hazardous for Lab Use?

    Dear all, I got 20 grams of Mgo powder to be milled (to obtain Nano-powder). The person in charge of the lab said, being explosive (or something else), Mgo is a dangerous material to work with. Is it true? (since I have not found this anywhere else and some friends said it is not the case)
  10. M

    Powder pattern calculation from single crystal data

    Powder pattern calculation from single crystal data Hi Kindly, I want to know what the theoretical base of X-ray powder diffraction pattern calculation from single crystal data? and is the obtained pattern same as experimental powder pattern and if not same what the cause of difference? Thanks
  11. E

    What can i possibly do with graphite powder.

    I have a bottle full of graphite powder from a failed experiment and now it just sits there doing nothing. I hate art, so no graphite related artwork... All the machines in my house are lubricated enough... What can i do with the excess graphite powder ?
  12. ص

    Powder photographs of two specimens A and B

    powder photographs of two specimens A and B, are taken with a camera of radius 9cm.the arc ( difference between coresponding lines on the film )are shown in the pure below. both of which are known to belong to the cubic system sepcimen A is pure while B contains some impurities which gives rise...
  13. EnumaElish

    Roach killer powder works on humans, too

    AFAIK, boric acid is most commonly sold as a roach killer, although apparently it has many other more benign uses. I happen to know that it works pretty well on common fungi that appear around sweaty human joints. Wikipedia says it's used to control uranium fission in nuclear plants. Has...
  14. D

    Ceramic Powder processing progress -

    Ceramic Powder processing progress - urgent Hey there, Would really appreciate some urgent help here more like direction. I'm looking into the progress of colloidial ceramic powder processing and am getting a bit confused. Could anyone point me as to any good papers that could help me...
  15. S

    Determine crystal lattice structure from powder XRD

    Homework Statement Using the powder XRD data below, show that the substance has a face centred cubic structure. (xray lamda = 0.154056 nm) Peak No.------2(theta) 1 -------------38.06 2 -------------44.24 3 -------------64.34 4 -------------68.77 5 -------------73.07 Homework...
  16. R

    Iron Powder + Epoxy Armature for Generator

    Any have good results by mixing iron powder and epoxy, purpose is to create an armature for a generator.
  17. T

    Maintaining a temperature of 70 degrees in a metal powder

    I am making a bonded magnet and have the need to maintain a temperature of around 70 C in a magnetic powder compressed in a stainless steel mold for a period of about 2 hours, before cooling rapidly to room temperature. i was thinking about using some sort of infra red heating, but would like to...
  18. L

    Will carbon powder dissolve (ionize) in sulfamic acid? If so, what ionic state?

    Will carbon powder dissolve (ionize) in sulfamic acid? If so, what ionic state?
  19. R

    Looking for Powder XRD Purchase - University Research

    Hi everybody, we are looking for powder XRD purchase to our University. Is anyone tell me what firm is better, what kind of accessories to purchase? I heard that Panalytical made some device for nanomaterials size measurements. Anybody knows how does it works and is this good? Thanks a lot.
  20. B

    X-ray Powder Diffraction: Determine Structure of Crystal

    Hello! X-ray powder diffraction can be used to determine the structure of crystal. I am given the diffraction angles (theta) for a sample and I am supposed to see if it has fcc, bcc or diamond structure. I read that if one plots sqr(sin(theta)) against ( sqr(h) +sqr(k) +sqr(l) ) where h, k, l...
  21. P

    Stainless steel 409 Cb powder sintering chracteristics

    Hi I am doing a project on powder metallurgy. I have to design a sintering process for a component. The component is already in production it is the Hego boss (o-ring)on exhaust systems. I have a problem on finding a sintering curve for the material stainless steel 409 Cb, (some kind of...
  22. K

    How can powder be sampled under vacuum in a flowing pipe?

    Good day I'm wondering how to sample powder that is flowing through a pipe under vacuum. Which systems can be used for this? I have a DN300 pipe under slight vacuum (ranging -500 mbarg to -100 mbarg). The sampler should be connected to the pipe. These are the process conditions of our...
  23. J

    Analysis of X-rays Reflected Off Copper Powder

    Homework Statement X-rays 1.54 angstrom reflected off copper powder @ 21.65º 25.21º 37.06º 44.96º 47.58º Homework Equations nλ = 2d sin(Θ) ; the Bragg equation The Attempt at a Solution The cubic latice is face centered at d110? 5 planes? I tried plotting...
  24. S

    How could i dissolve iron powder

    I want to make a standard iron solution 1 g/L by using iron powder and i can't dissolve it by any way. Is anyone have an idea? thanks in advance.
  25. C

    How Does Powder React When Squeezed Inside a Cube?

    If I have cube with top side opened with powder in it an i start pushing two sides of cube together will powder fall out of cube the same as with water or other liquid?
  26. DaveC426913

    Uncovering the Mystery: What is the Powder in My Driveway?

    I found a powder in my driveway earlier today. I have no idea where it could have come from but I'm curious because it seems so out of place. It's very dark brown, almost, but not quite black (see attached) and utterly uniform in colour. It's extremely fine, finer than icing sugar. So fine...
  27. V

    How we determine conductivity of powder?

    how we determine conductivity of powder?? hmm...i got a question.. i had three inorganic polymer (powder/solid form) and i want to mixed it according to various composition. how can i determine the conductivity? do i need special equipment to read the conductivity or can i just dissolved...
  28. J

    Byproducts from messed up gun powder

    Then you make black powder with KNO3 + S + C and if your ratios are abit messed up. Can somebody please answer these 2 weird questions for me? 1. What’s the white stuff forming then the messed up mixture burns, it’s like ceramic of something 2. And something is extremely slippery if you...
  29. D

    Mystery Powder: Uncovering the Secret Behind Its Creation

    Ok so I mixed alum (aluminium potassium sulfate... I think), flower,and cornstarch in a 1:1:1 ratio, and put that in a covered pot and heated it till it produced no more smoke/fumes. This was an attempt to make a rapidly oxidizing powder in air. It was very blind science, I am sorry to say. It...
  30. Integral

    Black Powder Fun: Enjoying a Vintage Trapdoor Springfield & Colt 45 Replica

    Years ago I hunted and shot guns with regulatrity but just 20yrs ago I sold my sweet little Ruger 10-22 and have not fired a shot since. A friend and coworker has been trying to get me out black powder shooting for several years now. Finally, yesterday we "got 'r done" Here I am holding a...
  31. Facial

    Use of steel powder in composites

    How effective is using steel powder in a polymer/ceramic composite matrix? I am wondering this from observing this product called Faststeel which is one of those epoxy putty sticks that claims to be steel-reinforced. I actually think that it will make a material stronger than the matrix...
  32. H

    How Can I Grind Wasabi Fibre Into Powder?

    I have bought a few wasabi plants recently, I have been trying to grind some of the stem of the wasabi into paste (as shown in the supermarket), the trouble I am having is gridingthe fibre down. First thing I tried is using a blender, it works fine on most part, but I just can't grind the...
  33. B

    Stoikiometry for gun powder

    I need some help on how to find out how many grams of each substance i need to make gun powder for my Chemisty class. I have the equation its 2KNO3+3C+S -->3CO2 + K2S+ N2 I know that there are 10 grams but i have to figure out how many grams are for each substance. I'd just like someone point me...
  34. D

    Protein Powder and Beef Powder

    I've adopted a Vegetarian diet and I'm wondering about Protein Powder and Beef Powder. I'm assuming Protein Powder does not contain meat, but does Beef Powder? I was looking at a package of Vegetarian bacon which listed beef powder as an ingredient.
  35. B

    What's the function of the Ca(H2PO4)2 in the baking powder?

    some types of baking powder consist of sodium bicarbonate, NaHCO3, and calcium dihydrogen phosphate, Ca(H2PO4)2. Can anyone explain the function of the Ca(H2PO4)2 in the baking powder?
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