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===Ingassing model===
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The half time of a tissue is the time it takes for the tissue to take up or release 50% of the difference in dissolved gas capacity at a changed partial pressure. For each consecutive half time the tissue will take up or release half again of the cumulative difference in the sequence ½, ¾, 7/8, 15/16, 31/32, 63/64 etc.<ref name="Bookspan"/> Tissue compartment half times range from 1 minute to at least 720 minutes.{{sfn|Yount|1991|p=137}} A specific tissue compartment will have different half times for gases with different solubilities and diffusion rates. Ingassing is generally modeled as following a simple inverse exponential equation where saturation is assumed after approximately four (93.75%) to six (98.44%) half-times depending on the decompression model.<ref name="Huggins 1992 Chapter 2"/><ref name=logodiving /><ref name="Maiken" /> There is normally no phase change during ingassing after the gases are dissolved in the blood of the pulmonary circulation in the lungs. They remain in solution in whichever tissues they reach by perfusion and diffusion, so the model is fairly robust. The exception is for [[isobaric counterdiffusion]] which can induce bubble growth and posssibly bubble formation when a gas of different solubility is introduced to the breathing mixture.{{sfn|Hamilton|Thalmann|2003|pp=477–478}}<ref name="Lambertson 1989" />
This model may not adequately describe the dynamics of outgassing if gas phase bubbles are present.<ref name="Wienke 1990" /><ref name="Yount 1990" />
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