Even if there aren't actually that many hydrogen ions floating around.

即便实际上没有那么多游离氢离子。

And current leaving your saliva through the other lead creates oxygen gas, leaving hydrogen ions behind.

通过另一端离开唾液的电流生成氧气，留下氢离子。

So when we say that the pH is the negative log of the hydrogen ion concentration...

因为10的2次方。

Meanwhile, sour-tasting acidic foods are high in hydrogen ions and take a different route by activating proton channels.

同时，酸味的酸性食物富含氢离子，通过激活质子通道采取不同的路线。

Because hydrogen ions, or protons, are pivotal to the behavior of acids and bases, which is what pH describes.

不过它也可能仅仅是。

Just as we can calculate the pH of a substance from it's hydrogen ion concentration, we can calculate the pOH.

就是一种在不同pH值环境中会显现不同颜色的化学物质。

The pH scale only really works down to 0, where there's one hydrogen ion for every molecule in the solution.

pH 值测量范围最低只能到0，此时溶液中每一个分子都能电离出一个氢离子。

One way the body can increase the blood pH is by moving hydrogen ions out of the blood and into cells.

机体提高pH值的一种方式是将氢离子从血中移入细胞内。

These hydrogen ions are what sour taste receptors in your taste buds pick up on; they're also found in acidic foods.

这些氢离子就是味蕾感受到酸味的原因， 它们也存在与酸性食物中。

One way the body can decrease blood pH is by moving hydrogen ions out of cells and into the blood.

机体降低血液pH的一种方法是将氢离子移出细胞进入血液。