West Asian/African science under Roman rule
What we call Roman science is a mixture of two different things. The first is the discoveries and inventions made by scientists working in parts of West Asia and Africa that the Romans had conquered.
Earlier West Asian science
Science in ancient Egypt
Earlier African science
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In these places, scientists had already been working for a long time. They just kept on working under Roman rule. (And then they were still working under Islamic rule later on).
Glass, pottery, and sails
In Phoenicia, craft workers invented blown glass, and mold-made pottery and oil lamps. It’s probably Phoenicians, too, who designed better sailing ships. They experimented with building ships more efficiently from the inside out rather than from the outside in.
They also developed triangular sails, which we call “lateen sails” (or Latin sails). These sails helped ships tack into the wind, so they could sail a different direction from the way the wind was blowing.
New medical treatments
Egyptian doctors continued to lead the world in medicine, doing experiments with electric fish shock therapy. Nearby, in Pergamum (modern Turkey), medical research also continued from before Roman times. Galen worked there in the late 100s AD.
Galen was the first to describe many symptoms and treatments. His medical textbook was the European standard for over a thousand years. Galen knew that the heart pushed blood around the body, and that nerves carried messages from your brain.
Throughout Roman rule the best colleges stayed where they had been before: in Greece at Plato’s Academy and Aristotle’s Lyceum, and in Egypt. The famous University of Alexandria in Egypt kept right on teaching students and gathering scholars after the Romans conquered Egypt.
That’s where the astronomer Ptolemy developed new theories about how all the planets moved around the Earth, and even if his ideas were mostly wrong, he took very careful measurements that helped later astronomers figure out the truth. Ptolemy also produced a better map of the world, though it still got a lot of things wrong.
Roman science in Europe
But the Romans themselves, in Italy, also built up the first good schools and research institutions in Italy and western Europe.
It was these Roman engineers who invented a lot of new ways to mine for metals like silver and gold and lead. (But they learned from Chinese scientists how to use mercury amalgams to do silver-plating and gold-plating.)
Roman concrete, domes, and water mills
The use of concrete helped them to develop the dome and the barrel vault and the cross vault. They used their vaults to build aqueducts to carry fresh water to towns, and they used their engineering skills to build sewage systems to keep their towns clean and healthy.
Mathematics during the Roman Empire probably focused mainly on developing trigonometry to be able to predict the movements of the planets.
Science in Ancient Rome, by Jacqueline Harris (1998).