• HOME >
  • How to enjoy tea

Cooling speed of water differs depending on the volume of teapot

[2018.01.23] Posted By

The smaller the size of teapot the faster the temperature it cools down

Some people tends to use a small teapot to brew tea, and assumed that smaller teapot can hold the temperature. The fact is the smaller the teapot, the the faster the temperature drops. It is because of the ratio between the inner surface area and the volume of water. The specific surface area becomes smaller when the volume of teapot is bigger. On the contrary, the smaller the teapot, the more specific surface area. As a result, more water exchanges its heat energy with the surface of clay and it cools down water faster. After all, the smaller the teapot, the faster it cools down. Relatively, the big teapot can hold the temperature for a longer time.

Brewing Japanese green tea

In general, the brewing temperature of Japanese green tea is recommended at below 80 degree C. It is because most of Japanese green teas are grown with fertilizer which makes the taste of tea very bitter. The bitterness comes from caffeine. The caffeine will be effectively extracted with hot water above 80 degree C. So, if we brew tea at below 80 degree C, you can avoid or minimize the bitterness.
On the other hand, some Japanese green teas grown without fertilizer originally give the least bitter taste. So, it is not necessary to brew it at lower temperature. On the contrary, it is very important to brew these teas at higher temperature in order to effectively extract the flavor substance, reduce the astringency and enjoy a clean and clear drinking sensation.

A big teapot is suitable for a beginner.

Brewing tea at high temperature is not that easy as how it sounds. It requires various brewing skills, such as pre-heating of teapot and rinsing tea with boiling water. In most of the cases, a beginner might face greater challenges to brew tea at high temperature. Considering this fact, we recommend the beginner to use a bigger teapot. As I mentioned earlier, a big teapot retains the heat for a longer time. Even if one does not have a good skill of brewing, it is less difficult to maintain it at very high temperature throughout the brewing. Of course, a small teapot is also a useful equipment as long as it is handled with skills.
https://hojotea.com/jp/posts-1029/

Measurement of water temperature in different size of teapot


The above video was made based on three different sizes of teapot. These teapots are made from exactly the same clay (i.e., the Akitsu Mumyoi Oxidation Fired Teapot). I poured boiling water into three teapots and left for a minute. The volume is 100ml (right), 140ml (middle) and 300ml (left). We noticed that there was 6 degree C of difference. These teapots are not pre-heated.

100ml 79℃
140ml 83℃
300ml 85℃

The room temperature was at around 25 degree C. If we conduct the same experiment in a colder room, the difference will be more. If the teapot with the volume of 100ml is not pre-heated, the temperature reduced around 20 degree C. The temperature inside the teapot is much lower than what we imagine.

Related Articles

How to get the latest update on HOJO Tea?

1. Follow Twitter, 2. Click "Like" on Facebook, and 3. Subscribe in newsletter. You can have the latest tea news from HOJO Tea.

Subscribe the Newsletter to enjoy the privileges
You may receive a free sample upon purchase, or you may have the priority to purchase special products. So please remember to subscribe our newsletter as well as the social network.
  •                 

HOJO TEA Online Shop NEWSlist

Taiping Houkui 2019 is now available in our store
2019 Taiping Houkui is available in our store. Taiping Houkui was listed as the Top Ten Famous Teas in China. It has been the well-known green tea of Anhui province since Qin dynasty. We have both standard and special tribute grade. The special tribute grade was grown at higher altitude and it gives longer lasting …
2019 Chinese Green Teas are available in our store
We have now received three types of 2019 Chinese green tea and one yellow tea. Thanks to less rain in this spring, the quality of these teas is excellent. Shi Feng Long Jing 獅峰龍井茶 Long Jing is the well-known Chinese green tea. It is produced in Zhejiang Province. In particular, Shi Feng Long Jing produced …

NEW ARTICLES

Taiping Houkui 2019 is now available in our store
2019 Taiping Houkui is available in our store. Taiping Houkui was listed as the Top Ten Famous Teas in China. It has been the well-known green tea of Anhui province since Qin dynasty. We have both standard and special tribute grade. The special tribute grade was grown at higher altitude and it gives longer lasting …
2019 Chinese Green Teas are available in our store
We have now received three types of 2019 Chinese green tea and one yellow tea. Thanks to less rain in this spring, the quality of these teas is excellent. Shi Feng Long Jing 獅峰龍井茶 Long Jing is the well-known Chinese green tea. It is produced in Zhejiang Province. In particular, Shi Feng Long Jing produced …
Pre-Booking of Da Xue Shan Wild Tea and White Tea Mao-Cha 2019
We open the pre-booking of Da Xue Shan Wild Raw Pu-erh Tea and Wild White tea in loose form (mao cha). This year we have very limited stock of loose tea. We will close the booking once the quantity of order reaches our quota. Tea is arriving soon in Japan. So, we should be able …
The Field Report of Yunnan Tea in 2019
We have been staying in Yunnan since 9th of April for sourcing spring tea. In previous years, we usually came here before the end of March. This year, we shifted our schedule about 10 days later since we wanted to stay here until the end of spring tea season. This past week, we were engaged …
Limited Release of Rare Single Tree Pu-erh, White and Black Tea
We have opened the sales of Single Tree Tea (Dan Zhu Tea) produced in 2018 spring. Single Tree Tea refers to the selected tea produced only from one particular tea tree. It is considered as the most exclusive quality of all. For oversea customer, please visit the following page. https://hojotea.com/en/posts-213/ So far in Yunnan, only …
New Release of Vintage Guo Gan Ripe Pu-erh Tea
We released very rare and limited ripe pu-erh tea. It is 9 years vintage ripe pu-erh tea from Guo Gan in Myanmar. It gives distinctive vintage tea flavour with a hint of dry-fruity flavour and herbal-like aroma. Tea grown in Myanmar-China border town Guo Gan is the place in Myanmar facing to Yunnan, China. This …
New Release of High Mountain Purple Black Tea 2018
We have released High Mountain Purple Black Tea 2018. This tea is one of the very popular Yunnan black tea in our line-ups. Since it is a very cold season now in Japan, this tea suite very well. I often enjoy this tea recently. Purple Tea variety gives very special flavour The high mountain purple …
Tsukigase Sencha Processed with Long Withering
We made an interesting green tea with Tsukigase’s spring tea. It is sencha, and we conducted long withering process to enhance its flavour. As a result, it gives a gentle floral scent that reminds me of Taiwan’s lightly fermented oolong tea. After producing tea in spring, in order to further enhance its flavour, we kept …
Cha Tou Brick 250g from Hou Cao Shan is available
We released Huo Cao Shan Cha Tou Brick 2017. This Cha Tou is from the same batch of tea we released earlier on pre-booking. Despite tea was produced about one year ago and not aged for a long time, it already gives very soft, mellow and rich drinking sensation with thick fruity flavour like Chinese …
The Secret of Jasmine Flower for Making Fine Jasmine Tea
Jasmine tea is made from green tea scented with the fresh jasmine flower. The quality of both green tea and jasmine flower is important. Jasmine tea consists of various cultivar and variety. The type of jasmine and the timing of plucking greatly affects the quality of jasmine tea. Heng Xian County of Guangxi is the …

PAGETOP