Estimates for the total mass of water on Earth, including all forms such as liquid, vapor, and ice, are around 1.39 × 10^21 kilograms (3.07 × 10^21 pounds). Approximately 97.5% of that is saltwater, and only 2.5% is freshwater. Of the freshwater, about 68.7% is trapped in glaciers and ice caps, and around 30.1% is groundwater, while only about 1.2% is surface water (lakes, rivers, and swamps). A very small portion of this water can be found in the atmosphere and living organisms.

To calculate the mass of liquid water, including water vapor and water in organisms, we'll start with the total mass of water (1.39 × 10^21 kg) and subtract the mass of ice in glaciers and ice caps. Then, we'll convert the result to ounces.

First, let's find the mass of freshwater on Earth:

1.39 × 10^21 kg × 0.025 (2.5% freshwater) ≈ 3.475 × 10^19 kg

Now, we'll subtract the mass of glaciers and ice caps:

3.475 × 10^19 kg × 0.313 (1 - 68.7% frozen) ≈ 1.087 × 10^19 kg

Now, we'll convert this mass to ounces (1 kg = 35.274 ounces):

1.087 × 10^19 kg × 35.274 oz/kg ≈ 3.834 × 10^20 oz

So, the mass of all liquid water on Earth, including water vapor in the air and water contained in plants and animals, is approximately 3.83 × 10^20 ounces with a precision of two decimal places
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