Introduction
In our routine life, there are specific fields in which we are required to measure the weight of water. It is not any difficult task to measure the volume of a liquid specifically water in a regular shaped container. All calculations are just a game of mathematical calculations of the capacity of that specific shaped container. Just make the measurement of the level of the water then make some required adjustments. But if the container has not any specific or regular shape, it becomes a challenging task. To cope up this issue, density does work. When we know the density of water at a specific temperature it becomes easy to calculate the weight of a volume of water. It becomes easy to measure the weight of the liquid within a container. Then, subtract the weight of the container and use the density of the water to get your answer. So, we need to know the density, amount of matter within a certain volume.
Density
Density is defined as mass per unit volume. In fact, it is a measurement as how tightly and heavy the molecules are packed in an object.
$$Density = \frac{Mass}{Volume}$$
Unit of mass is “g”
Unit of volume is “c3”
Actually, density is a specific property of liquid. Density of any specific sample of liquid will remain the same at the same temperature. The density of water is 1 g/cm3. You can check the density and specific water weight on the table
Table of Density and Specific Gravity of Tap* Water and Pure Water
| Temp (°C) | Density purewater (g/cm3) | Density pure water(kg/m3 | Density tap water (g/cm3) | Density pure water lb/cu.ft | Specific Gravity 4°C reference | Specific Gravity 60°F reference |
| 0 (solid) | 0.9150 | 915.0 | - | - | 0.915 | - |
| 0 (liquid) | 0.9999 | 999.9 | 0.99987 | 62.42 | 0.999 | 1.002 |
| 4 | 1.0000 | 1000 | 0.99999 | 62.42 | 1.000 | 1.001 |
| 20 | 0.9982 | 998.2 | 0.99823 | 62.28 | 0.998 | 0.999 |
| 40 | 0.9922 | 992.2 | 0.99225 | 61.92 | 0.992 | 0.993 |
| 60 | 0.9832 | 983.2 | 0.98389 | 61.39 | 0.983 | 0.985 |
| 80 | 0.9718 | 971.8 | 0.97487 | 60.65 | 0.972 | 0.973 |
This is for clean water but can vary from area to area.
Density of liquid water from 0 ℃ to 100 ℃ is given below
Volume
To find water weight, without the weight of the container, you require another container or gallon to measure the weight of the first container. So, first of all, check the weight of the container. For accuracy, your container should be dry. After that, pour the water into the container and check the weight of both collectively. Then subtract the weight of the container from this calculation to get the weight of water. To find the volume of the water divide the mass by the density of water.
$$Volume = \frac{Mass}{Density}$$
There is given the volume of 1 gram of water at different temperatures in the following table.
| Temperature (°C) | Volume (mL) |
|---|---|
| 17.0 | 1.0022 |
| 18.0 | 1.0024 |
| 19.0 | 1.0026 |
| 20.0 | 1.0028 |
| 21.0 | 1.0030 |
| 22.0 | 1.0033 |
| 23.0 | 1.0035 |
| 24.0 | 1.0037 |
| 25.0 | 1.0040 |
| 26.0 | 1.0043 |
How to Use length, Width and Height to Calculate Volume?
As volume is three dimensional state so you can easily multiply these three given sides in any order. It does not matter which side is width, length or height.
$$Volume = Length * Width * Height$$
Specific Weight of Water
The specific weight actually is the weight per unit volume of matter. The value of the specific weight of water is 9.807 kN/m3 or 62.43 lbf/ft3
How Much Does a Gallon of Water Weigh?
Generally, the weight of a gallon of water is 8.35 lbs or 3.80 Kg at 17 °C. But if we talk about a grand size gallon of water weight at the densest temperature, it will be almost 10.024 lbs or 4.547 Kg
How to Calculate the Weight of Water?
Here is a step by step procedure to calculate the weight of water
- Find the volume and density of water
- Convert the specific volume into liters
- Multiply volume by the density
It’ll be your required number as
$$Weight = volume * density$$
Weight of Water for different volumes
| Volume | Weight (oz) | Weight (lb) | Weight (g) | Weight (kg) |
|---|---|---|---|---|
| 1 teaspoon | 0.0109 | 0.1739 | 4.929 | 0.004929 |
| 1 tablespoon | 0.0326 | 0.5216 | 14.787 | 0.0148 |
| 1 cup | 0.5216 | 8.345 | 236.59 | 0.2366 |
| 1 pint | 1.043 | 16.691 | 473.18 | 0.4732 |
| 1 quart | 2.086 | 33.382 | 946.35 | 0.9464 |
| 1 gallon | 8.345 | 133.53 | 3,785.4 | 3.785 |
| 1 milliliter | 0.002205 | 0.0353 | 1 | 0.001 |
| 1 liter | 2.205 | 35.274 | 1,000 | 1 |
| 1 cubic inch | 0.0361 | 0.578 | 16.387 | 0.0164 |
| 1 cubic foot | 62.428 | 998.85 | 28,317 | 28.317 |
| 1 cubic yard | 1,685.6 | 26,969 | 764,555 | 764.55 |
| 1 cubic centimeter | 0.002205 | 0.0353 | 1 | 0.001 |
| 1 cubic meter | 2,204.6 | 35,274 | 1,000,000 | 1,000 |
If you are here to find the weight of water, I am really hopeful that this tool will be proved helpful to you in this regard.