14-10-2022
What does it mean that something is kosher? The terms ‘kosher’ and ‘kosherness’ are mainly associated with the culture, lifestyle and religion of the Jews. Although many people have heard about that concept, they are unable to explain what kosherness is or what it actually implies. What are the fundamental principles of kosherness and to […]
14-10-2022
Precious stones have fascinated people for decades. They used to serve as a means of payment or a part of ornaments worn by the wealthiest social classes. In the 21st century, they are still as popular as before. How to recognise precious stones? Here are 4 proven methods!
12-09-2022
Each of the great world religions has its own individual principles which concern, among other things, the consumption of a particular type of food, its origin or the way in which it is prepared. These rules are more or less restrictive depending on the religion. Some of them indicate the exact types of products authorised […]
5-08-2022
Everybody must have heard about noble metals such as gold, platinum or silver. But then very few people know there are also gases called noble. They include, e.g.: helium that we readily associate with country fair balloons or neon that is ubiquitous in city streets. What properties do noble gases have and where are they […]
19-07-2022
Hydroxides are chemical compounds in which a hydroxyl group is found in the molecule. They can be acidic, basic or amphoteric. The group of amphoteric compounds includes a compound with the molecular formula Al(OH)3, called aluminium hydroxide. What are the main uses and properties of aluminium hydroxide? Let us find out.
18-05-2022
Svante August Arrhenius, a Swedish physical chemist and astrophysicist, was the first to discover and describe the phenomenon of the decomposition of acids in 1887. The researcher observed a relationship between the structure of chemical substances and electrical conductivity. The scientist classified bases, salts and acids that undergo the dissociation process, among others, as electrolytes, […]
13-05-2022
Railways have been one of the key modes of passenger and freight transport since the mid-19th century and continue to play an important role today. Although technology is changing, and road, air and port infrastructures are able to handle an increasing number of transport vehicles, rail transport is still very important in the Polish and […]
12-05-2022
Uncontrolled leaks can occur during various operations related to the production, transport or handling of various liquids, such as fuel or acids. How can you control dangerous substances and protect people as well as the environment from contamination? In such cases, invaluable help is available from sets of sorbents – what are they and what […]
12-04-2022
The word tattoo (tatau) comes from Polynesia, meaning sign or painting. The history of tattooing is very long and goes back over 4,000 years. As early as the beginning of our civilization’s history, people introduced various dyes into the skin, thanks to which, patterns related mainly to rituals, were created.