Recent content by LT72884

  1. L

    Dry ice -- How do the stores keep it from evaporating?

    Thats a good read. I have red it in the past. I was just curious how my walmart stores it and what type of machine they use. Next time im there, ill take a peek at it
  2. L

    Dry ice -- How do the stores keep it from evaporating?

    so your saying the cooler that they store the dry ice in is a powered refrigerator, like a meat freezer? thus keeping it longer? So if i put in a deep freezer, with no other food, would that be ok then?
  3. L

    Dry ice -- How do the stores keep it from evaporating?

    How do they keep it longer than i can at my house? a 5lb block is gone with in 30 hours, but yet, at the store, a 5 pound block has been in there for a while.
  4. L

    Dry ice -- How do the stores keep it from evaporating?

    Ok, how do stores keep dry ice from sublimation(i think i spelled that correctly) or evaporating? Are the coolers at my local walmart some sort of special type of mechanism? thanks
  5. L

    High pitched noise with some elctronics

    The electronics seem to be working fine. it prints and does what i need it to. I was thinking it was something to do with magnetics. thanks again
  6. L

    High pitched noise with some elctronics

    Hello:) I am working on my new 3d printer and i came accross an interesting situation. According to the manufacture, my stepper motors need to have a voltage of roughly 0.95 volts. I checked mine and they were 0.81 volts, hence the not so smooth prints. Ok, so i increased the voltage to the...
  7. L

    B Density and pressure -- How to calculate atmospheric pressure at higher elevations?

    Those are interesting formulas. Now i just need to find all the other numbers and calculate density in my area haha. I know pressure can effect volume, but where is that in the basic density equation? What substitutes in for volume that has P involved? Thanks for all the jelp
  8. L

    B Density and pressure -- How to calculate atmospheric pressure at higher elevations?

    Ok, we all know that density is mass/volume. So if air is 1.22kg/m3,If we increase pressure, volume will change, therfore density can change. So how does one calculate density of air at higher elevations. Where i currently live, at 4700ft above sea lvl, im guessing air density is not 1.22kg/m3...
  9. L

    B Confused about the ideal gas law

    This is all good to know haha. Breaking the old indoctrinated info with new info haha
  10. L

    B Confused about the ideal gas law

    I tried that and ended up with a number not close at all to what was needed haha
  11. L

    B Confused about the ideal gas law

    Correct. I can use pv/t for my calculations. I was just stuck on the fact that air is always 1.22kg/m3 but it aint haha
  12. L

    B Confused about the ideal gas law

    Thank you:) this is one of yhe equations i have in my notes and book. I guess where my confusion was is the fact that density of air is not always 1.22kg/m3 haha
  13. L

    B Confused about the ideal gas law

    true, but if i take a room at 72F and put a wall in the center to divide it in half, the temp on both sides would be the same 72F. the volume of air would be diffeernet than the original value, but the density would be the same and so would the specific volume as well as the mass.
  14. L

    B Confused about the ideal gas law

    yeah, the volume of air changes(decreases), and not the mass since none escaped. so density would be different then. yes, "no matter what" is a strong statement and that is why i am confused haha. because all the basic physics stuff i took is now being challenged in thermo haha
  15. L

    B Confused about the ideal gas law

    to answer your first question, i thought density never changes for a substance. that is why it is called an intensive property? its ALWAYS 1000kg/m3 or 1.22kg/m3, etc etc. because if it were to change, then all my problems i did for finding pressure in a multifluid manometer, would be wrong...
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