Recommendation? Where to fill up on liquid nitrogen in central massachusetts

timos-

timos-

Knifemaker / Craftsman / Service Provider
Joined
Oct 22, 2012
Messages
2,212
Hey, anyone doing ln2 cryo in Mass?
 
Or........ Just how LARGE a batch?

Oops!
I just now See, he is IN Mass.
 
Woops sorry, in Massachusetts. Yeah , how to get ln around here, air gas no go.
 
I believe the formula is M=(txT/n)m²/h
where:
M= mass
t= time
T= temperature
n= number of blades
m= number of moles of LN
h= Plank's constant
 
The moles wont share their LN either. Maybe i can start a ice cream business to get some of that sweet liquid knife nectar
 
I fill my Dewar at a local independent welding and gas supply house, for about $1.50/liter. Look for an independent!
 
I buy from a welding company that is sole source in the valley. Their biggest customer is the hospital system then ranchers wanting to freeze sperm for ai.
 
Stacy E. Apelt - Bladesmith said:
I believe the formula is M=(txT/n)m²/h
where:
M= mass
t= time
T= temperature
n= number of blades
m= number of moles of LN
h= Plank's constant
Click to expand...
Stacy, I'm a bit suspicious of your formula. You don't specify x, but it would need unusual units to come out with kg on both sides. Not to mention the inverse dependence on number of blades...
 
"x" was a times symbol. A blacksmith would not understand M=(tT/n)m²/h
The number of moles in the LN Dewar is greatly larger than the number of blades, making the inverse proportion of the tT/n insignificant. (Note for the blacksmiths reading this - moles are not the critters eating up your lawn. They are much smaller. Even smaller than voles.)

And, yes Richard, your sharp eyes spotted that I neglected to state that M is in Kg. - Mea culpa. Nor did I state time was in minutes and temperature in Kelvin. Of course, everyone knows that Planck's constant is 6.62607015 × 10-34 (for blacksmiths, that's 10 to the negative 34th power, usually referred to at blacksmith events as " Just a Little".)

To convert liters to moles use n=V/Vm At STP Vm (molar volume*) is 22.413962. To convert STP nitrogen to liquid nitrogen use 700 liters N at STP to 1 liters of LN.
*Just to clarify again for blacksmith, molar volume is not how many teeth you have left.

I am not picking on blacksmiths at all. Blacksmiths have been answering complex equations like this for hundreds of years. They usually take off their hat, look down, scratch the back of their neck, look back up and say, "Five or six ... maybe seven."
 
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Well, strictly speaking, Planck's constant is 10 to the negative 34th so that's 1 / gazillion.

Stacy corrected his formula.
 
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Dang, I have to slow down when typing. Corections made.

For fun when I get some spare time I will have to try and work that formula out for 5 blades totaling 1.5 Kilos cryoed in 10mliters of LN for 60 minutes. I have no idea what number it will solve to.
 
I didnt even realize i been messing about with quantum mechanics!
 
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