blood culture tube
ENIAC was the first digital general purpose computer, built in 1946, and with 17,468 vacuum tubes. The Illiac I, the first computer built and owned by a US educational institution, had 2800 vacuum tubes. The IBM 604 had about 2000 vacuum tubes.
Their rockets were empty tubes filled with gunpowder. Later these were improved and still are used
no, first generation computers used vacuum tubes.
vaccum tubes and valves.
the vacuum tube ( valve) used to store data ( like 50 kilobytes )
Syringe
They are filled with fluids
They are filled with fluids
They are filled with fluids
Bicycle tires have tubes, so you wouldn't have a tire filled with Slime. There are tubes pre-filled with Slime though.
red
Hollow tubes is an redundant expression. Tubes must be hollow, by definition. However tubes can be filled with something so they are not "empty" (they still will be hollow).
openings
Yes they are tubes. They are filled with blood.
echinoderms
Stories of early rocket devices appear through historical records from different cultures. Maybe the first rockets were accidents. In the first century AD the Chinese were said to have had a simple form of gunpowder made from saltpeter, sulfur, and charcoal dust. To create explosions during religious festivals, they filled bamboo tubes with a special mixture and tossed them into fires. If both ends of the tube weren't sealed, the escaping gas from the explosion would shoot out the open end, sending the tube in the opposite direction. So the first rockets were probably poorly built fireworks! The Chinese then started to experiment with these gunpowder filled tubes open at one end. At some point they attached bamboo tubes to arrows and launched them with bows. In time they discovered that the gunpowder filled tubes could launch themselves using just the power of the escaping gas. The true rocket was born.
Test tube racks are commonplace in school science labs and are used routinely to securely hold test tubes or boiling tubes that are being observed or filled.