Practice worksheet
Gaiwan Capacity and Tea Dose: A Measurement Worksheet
A seller’s maximum capacity is not automatically your brewing water amount. Compare three real product labels, measure a cold empty-bowl reference, work through six original cases and save a dry-leaf dose record with the water basis clearly named.
Capacity and tea dose need a named water quantity
A gaiwan’s advertised size is not necessarily the water amount you use. Before comparing grams of tea per 100 mL, write down which capacity or water quantity is in the calculation. Six grams divided by a 130 mL rim capacity and the same six grams divided by a 110 mL working reference produce different rates.
This worksheet helps you distinguish the numbers, measure an empty bowl with room-temperature water and calculate an explicitly labeled dry-leaf rate. Use your tea’s instructions for its brewing method, temperature and time. The numerical examples are original arithmetic exercises; they are not results of our own brewing trials or a universal gongfu recipe.
| Quantity | What it means here | Important limit |
|---|---|---|
| Advertised capacity | The seller’s number, with its stated basis if available. | Do not assume it means the amount you will pour in. |
| Maximum at the rim | A full-to-rim capacity stated by the manufacturer. | It is not a target fill for handling hot tea. |
| Your empty working-fill reference | The room-temperature water amount at a repeatable fill level you choose in the empty bowl. | A measurement reference, not proof that hot handling is safe. |
| New water added with leaves present | The freshly added water for that infusion, if you measure it appropriately. | Retained water and leaf displacement mean this is a different quantity. |
| Liquid poured out | What reaches the receiving vessel after draining. | Do not substitute it for the amount added or the empty-bowl reference. |
Real product labels distinguish rim capacity from capacity in use
Mud and Leaves publishes both figures on the three product pages below. Their current titles and specifications—not the numbers embedded in their older web addresses—identify the listed capacities. These are manufacturer statements checked on 30 October 2026; we have not independently measured the vessels.
| Named product | Published rim capacity | Published in-use capacity |
|---|---|---|
| Light Cloud Tianbai White Porcelain Gaiwan | 130 mL maximum at the rim | 110 mL capacity in use |
| Classic Tianbai White Porcelain Gaiwan with Brown Rim | 130 mL maximum at the rim | 110 mL capacity in use |
| Little Horseshoe Tianbai Porcelain Gaiwan with Gold Leaf Stamp | Approximately 120 mL maximum at the rim | Approximately 90 mL maximum capacity in use |
These examples explain why a seller’s maximum is a poor substitute for your own stated working reference. They do not establish a fixed 20 or 30 mL subtraction for every gaiwan. Shape, the chosen fill level and the basis of another seller’s specification can differ.
If a listing gives only “100 mL” without a basis, record that uncertainty. Ask whether it is rim capacity, a specified in-use fill or another measurement. You can still measure your empty bowl’s reference rather than quietly assuming the advertised number describes the recipe.
A capacity specification is also not a hot-handling guarantee. A wide rim, a convenient size or a positive review does not establish that your grip, lid position and pouring technique are safe. Learn handling with appropriate guidance and start cold; do not fill to the rim to copy a catalogue figure while practicing with hot water.
Measure an empty working-fill reference with room-temperature water
Use a clean, empty bowl, room-temperature water and a stable surface. A scale showing grams can give an approximate volume from water mass; a suitable graduated measuring vessel is an alternative. This task does not require weighing a hot gaiwan.
- Choose a consistent configuration. For example, use the bowl only, with the lid and saucer off the scale. Dry the exterior. Record the empty mass or tare the scale in that same configuration.
- Choose a repeatable fill level below the rim. Leave room to position the lid without pushing water over the edge. Describe a visible reference you can repeat. This is your empty-bowl measurement reference, not a manufacturer maximum.
- Check lid fit while the water is still at room temperature. If positioning it causes overflow, reduce the fill. Measure again in the original weighing configuration; do not add the lid to just one of the two weights.
- Subtract the empty mass from the filled mass. A tared scale gives water mass directly. At room temperature, water is approximately 1 g per mL, so about 110 g of water is about 110 mL.
- Record the approximation and repeatability. Note the fill reference and scale resolution. If repeating, use the same setup and record the range rather than giving the vessel an invented precision.
For example, three invented repetitions of 109, 110 and 111 g would support recording a reference of about 110 mL with a 109–111 g observed range. They would not support calling the capacity exactly 110.000 mL. These are illustrative values, not measurements of any listed product.
USGS explains that water density varies with temperature and dissolved material. The grams-to-milliliters approximation here is for room-temperature water; it is not an exact conversion at every temperature. Do not carry the 1:1 assumption into a precise measurement of boiling water.
A cold fill and lid check can reveal an inconvenient reference level, but cannot certify safe hot use. The measuring worksheet also cannot evaluate a cracked vessel, thermal behavior or your ability to drain it safely.
Calculate dry-leaf rate and show the denominator
Weigh the dry leaf before brewing in grams. A teaspoon is a volume measure; different leaf shapes and packing can give different masses. Do not convert every teaspoon into one assumed gram value.
Dry-leaf rate (g per 100 mL) = dry-leaf mass (g) ÷ explicitly chosen water quantity (mL) × 100 Dry-leaf mass for an illustrative chosen rate (g) = chosen rate (g per 100 mL) × stated water reference (mL) ÷ 100
| Inputs | Calculation | Result | How to interpret it |
|---|---|---|---|
| 6 g dry leaf; 130 mL advertised rim capacity | 6 ÷ 130 × 100 | About 4.62 g per 100 mL | Uses the rim number; not the same comparison as a working fill. |
| Same 6 g; 110 mL empty working-fill reference | 6 ÷ 110 × 100 | About 5.45 g per 100 mL | The leaf did not change; the denominator did. |
| Illustrative target 5 g per 100 mL; 110 mL reference | 5 × 110 ÷ 100 | 5.5 g dry leaf | A worked calculation, not a recommended dose for every tea. |
| Same illustrative rate; 90 mL reference | 5 × 90 ÷ 100 | 4.5 g dry leaf | Keep the basis explicit when scaling between vessels. |
For the same 6 g, the smaller denominator gives the larger calculated rate. That observation does not prove that one brew tastes stronger: extraction, infusion time, temperature and draining are outside this arithmetic.
Keep units consistent. Use milliliters in the denominator and grams of original dry leaf in the numerator. A note saying “6/110” without units and a water basis is difficult to repeat. A useful version is “6 g dry leaf; 110 mL empty working-fill reference; about 5.45 g per 100 mL on that reference.”
Once leaves are present, separate added water from empty capacity
Your empty working-fill reference describes water in an empty bowl. Adding leaves changes what occupies the bowl. After a rinse or earlier infusion, retained liquid introduces another difference. There is no fixed leaf-displacement allowance in this worksheet.
If you record newly added water for an infusion, give it its own field and identify the measurement method. It is not automatically the empty reference, the total liquid present among wet leaves, or the liquid you pour out. Use measuring equipment suitable for the task and temperature; exact hot-water measurement is not required to use the empty-bowl worksheet.
Also keep the original dry-leaf dose through later infusions. The mass of drained wet leaves includes absorbed or retained water. It is not a new measurement of how much dry tea you started with. Record intentional leaf additions or removals explicitly rather than silently replacing the dose with a wet weight.
You can compare recipes using an empty-reference basis, provided both records say so. If one recipe instead uses measured newly added water, preserve that distinction. Equal-looking numerical rates with different definitions are not yet a like-for-like comparison.
Use the rate to document a recipe, then test one change at a time
Start with instructions for the specific tea and brewing method. Rishi’s brewing guidance explicitly connects the amount, teaware, method, temperature and steep time to the particular variety’s instructions. A large-vessel recipe should not become a short-infusion gaiwan recipe merely because you can scale its water volume.
If an appropriate recipe is being scaled to another vessel, show both the original and new water basis. The worked 110-to-90 mL example preserves an illustrative rate of 5 g per 100 mL by changing 5.5 g to 4.5 g. It does not prove that the two vessels cool, pour or extract identically, nor that the chosen dose suits every tea.
For a tasting comparison, keep a small, useful record: tea identity, original dry-leaf mass, named water reference, infusion number, temperature, time and what changed. Follow the one-variable tea brewing log to compare results. Allow the drink to cool enough to taste safely.
For yellow tea, the first-cup guide offers a labeled starting experiment when package instructions are missing. It is not a validated optimum for every yellow tea, and this capacity worksheet does not turn it into one.
Six original cases: check the measurement before the recipe
All values below are invented exercise inputs. They do not report product tests or observed tea extraction.
Case 1
A listing says “100 mL” without a measurement basis. Can you record that as your actual infusion water amount?
Show answer and explanation for case 1
Not yet. Record it as advertised capacity with an unknown basis.
Ask how the figure was measured or establish your own empty working-fill reference. Do not silently equate a catalogue number with newly added water.
Case 2
You use 6 g of dry leaf. Your empty working-fill reference is 110 mL, but the rim specification is 130 mL. What rate describes the working-reference calculation?
Show answer and explanation for case 2
6 ÷ 110 × 100 ≈ 5.45 g per 100 mL on the empty-reference basis.
Using 130 gives about 4.62 g per 100 mL on a different basis. The leaf mass did not change; the denominator did.
Case 3
You weigh an empty bowl without its lid, then weigh the filled bowl with its lid. Does the difference give water mass alone?
Show answer and explanation for case 3
No. The difference includes the lid’s mass.
Use the same configuration for both weights. Check lid fit cold, then return to that configuration for the water-mass measurement.
Case 4
An illustrative recipe uses 5.5 g with a 110 mL reference. What dry dose preserves its calculated rate with a 90 mL reference?
Show answer and explanation for case 4
4.5 g, on the same explicitly stated reference basis.
5.5 ÷ 110 × 100 = 5 g per 100 mL; 5 × 90 ÷ 100 = 4.5 g. This preserves the arithmetic rate, not guaranteed taste or extraction.
Case 5
Your original dose was 6 g dry leaf. After a rinse the drained wet leaves weigh 17 g. Which mass belongs in the original dry-dose field?
Show answer and explanation for case 5
6 g. Record the wet observation separately if useful.
Wet mass includes water. It does not mean you added 11 g of dry tea. Keep the original dose unless you intentionally add or remove leaf.
Case 6
Your empty reference is 110 mL, you record 90 mL of newly added water, and 75 mL reaches the cup. May all three be labeled “water used”?
Show answer and explanation for case 6
No. Name the empty reference, newly added water and poured-out liquid separately.
Leaves and retained liquid make these different quantities. State which one is used for any calculated rate, and do not infer total liquid among wet leaves from the added-water number alone.
Download the worksheet and keep the useful uncertainty
Download the editable gaiwan capacity and dry-leaf dose record. It separates the seller’s figures, the cold empty-bowl reference and any later infusion observations.
Illustrative record—not a physical test Advertised figure: 130 mL maximum at rim My empty working-fill reference: about 110 mL, measured cold Original dry leaf: 6 g Calculation basis: empty working-fill reference Calculated rate: about 5.45 g per 100 mL on that basis Actual newly added water: not measured; do not claim 110 mL Next step: follow this tea’s method, temperature and time instructions
A record with “not measured” in the right place is more useful than a falsely exact figure. Keep the worksheet with the tea instructions and your brewing log. Recheck the reference when you change the vessel or deliberately change the fill level; the goal is a repeatable, clearly defined comparison.
Sources and further reading
- USGS Water Science School: Water DensityApproximate room-temperature water-mass conversion and dependence of density on temperature and dissolved material; not an exact boiling-water conversion.
- Mud and Leaves: Light Cloud Tianbai White Porcelain GaiwanCurrent specification distinguishes 130 mL maximum at rim from 110 mL capacity in use; the older URL number is not used as a measurement.
- Mud and Leaves: Classic Tianbai Porcelain Gaiwan with Brown RimCurrent specification gives 130 mL maximum at rim and 110 mL capacity in use; published values, not our physical measurements.
- Mud and Leaves: Little Horseshoe Tianbai Porcelain GaiwanApproximately 120 mL rim and approximately 90 mL maximum in-use capacity; retain the manufacturer’s approximation.
- Rishi Tea: How to Brew Loose Leaf Tea in a Simple BrewThe particular tea’s instructions identify teaware, amount, brewing method, temperature and time; not a universal gaiwan dose.