Good afternoon, gentlemen!
I didn't immediately answer your question because I
forgot ... I decided to make a video answer
- here it is:
The fact is that the value of 1.1 ml is set in the settings of our bottling line so we were surprised to hear that you counted 0.9 ml. But i think it's possible...
Let's try to figure it out:
1) A small amount of oil will always remain in the needle, on the walls of the ampoule, etc. For the purity of the experiment, I let the ampoule stand for about 10 minutes so that all the oil glass down.
2) Coefficient of thermal expansion. Yes.
View attachment 163607
It is no secret that bodies expand when heated and contract when cooled. So, for example, the height of the Eiffel Tower can change by
12 centimeters depending on the temperature!
In our case, the magnitudes are not so impressive, but the change in volume is visible for sure.
For example, I am lazy and sometimes I don’t heat the oil in the ampoule, but I put the ready-made syringe on the warm GPU radiator, and about 0.1 - 0.05 ml of oil ALWAYS accumulates in the plastic needle safety cap, which leaves the syringe due to thermal expansion.
0.007/°C is an acceptable approximate average value for oils. As a rule of thumb, oils may be expected to increase in volume by more than 1% of their total volume for each 14°C temperature increase. In particular, in the case of oils requiring heating, the ullage space must be calculated accordingly.
Let's count so... The usual comfortable temperature at home is about 25 degrees Celsius, it is advisable to warm the oil for a good injection to body temperature, that is, 36.6 degrees. This is more than 10 degrees, and the same 1 ml + remains on the walls, from which, alas, you can’t run away.
But even with this, yesterday I filmed the process of filling the syringe and I got 1.1 ml, even with all of the above.
View attachment 163608
View attachment 163609
I would be happy to check something other than MENT if you want.
