# 233 What happens when you breathe out underwater?
In which direction do the bubbles go? Upwards, of course. It still shocks me when I see even experienced nurses, medics, or doctors, trying to 'prepare an IV line' by holding the tubing downwards to a sink or wastebasket to express a turbulent flow of bubbles and fluid. As Chief Engineer Scott reminded Captain Kirk, "Captain, I canna change The Laws of Physics!"
Air will always rise in fluids, so the only efficient way of clearing the line is to avoid air and provide it an upward path to escape should there be any.
When spiking the container:
- Have the drip chamber pre-squeezed between thumb and forefinger.
- The tubing should be pulled upward sharply (to prevent flow) between lower fingers and over which the tubing makes an upward and downward arc like the aorta from the heart.
- Pierce the port firmly as you insert the spike.
- Slowly release the drip chamber to half-fill it with solution.
- Release the crimped tubing carefully so that flow begins without turbulence or bubbles and a clean meniscus of fluid rises in the tubing pushing all air out before it.
- In seconds, you have cleared the line with minimal effort and maximum speed.
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