1, coffee extraction degree
The coarser the grinding degree, the longer the brewing time of coffee, so as to fully extract the essence of coffee. Conversely, the finer the grinding degree, the shorter the brewing time of coffee. Usually, it takes 4-8 minutes to extract coffee powder with coarse grinding degree, and only 1-4 minutes for coffee powder with fine grinding degree.
2. Water velocity
Water quickly passes through the ground coffee powder and vice versa.
3. The feeling of coffee powder
The simplest and most effective way to judge the grinding degree of coffee powder is to feel the thickness of coffee powder with your fingers. We just need to rub a pinch of coffee powder repeatedly between thumb and forefinger, and we can roughly judge whether the coffee powder is coarse or fine. To put it more vividly, coarse ground coffee powder feels like sea salt, medium ground coffee powder feels like sand, and fine ground coffee powder feels more like sugar.
4. The taste of coffee
The final criterion for judging the degree of coffee grinding is the taste of coffee. Taste is a very objective sensory experience. As long as you judge the following points, you can easily judge whether the grinding degree of coffee is correct. If the coffee is too bitter, too astringent, or too strong, then the coffee grinder should be adjusted to make the grinding degree coarser; If the coffee is too sour, too weak, or lacks flavor, then you need to adjust the grinding degree slightly next time.
Extended data:
The benefits of coffee:
1, coffee has the function of diuresis and dehumidification. Caffeine can promote renal function, expel excess sodium ions from the body, increase urine output, improve abdominal distension and edema, and help to lose weight.
2, coffee can be appetizing staple food. Caffeine can stimulate sympathetic nerve, stimulate gastrointestinal secretion of gastric acid, promote digestion, prevent abdominal distension and gastroptosis, and promote gastrointestinal hormones and peristalsis hormones, thus quickly relieving constipation.
3. The whitening effect of coffee. So drinking a cup of black coffee after a meal can effectively whiten the skin. In addition, black coffee also has diuretic effect. Black coffee can also promote cardiovascular circulation. For women, black coffee has a cosmetic effect. Drinking it often will make you radiant and radiant. People with low blood pressure can get better by drinking a cup of black coffee every day.
In the process of brewing coffee at high temperature, it will also produce an antioxidant compound, which is helpful for anti-cancer, anti-aging and even prevention of cardiovascular diseases, and can be comparable to fruits and vegetables.
4, coffee can extinguish the wind and stop convulsions. Coffee can increase high-density cholesterol, accelerate the metabolism of bad cholesterol, reduce coronary atherosclerosis and reduce the probability of stroke.
Coffee contains some nutrients. Nicotinic acid in coffee contains vitamin B, and roasted coffee beans have higher content. But also free fatty acids, caffeine, tannic acid and so on.
6. Coffee is good for the skin. Coffee can promote metabolic function, activate digestive organs and play a great role in constipation. Bathing with coffee powder is a kind of hyperthermia, which has the function of losing weight.
Baidu encyclopedia-coffee