A fluid is a substance that can flow. Liquids (ex.water) and aeriform  substances (ex.smoke) are fluids. 
They don't have their own shape but they conform to the boundaries of the container in which they are placed.

1- PLASTICINE IN H2O 

In this experiment we have two balls of plasticine that have the same weight. We notice that if we put one of the balls in the water, it sinks but if we change the shape of the other ball into a sort of boat, it floats.

In this experiment we use two syringes linked with a small tube. If we push down one of the syringes' pistons the other one rises.

In this experiment we notice that if we move the syringes the coloured water inside them goes up and down and stops at a certain point. 

4- FISH IN THE BOTTLE (with cork) 💧🐠

In this experiment we have a water full of water with a fish of plastic inside it. We see that if we push the bottle the fish sinks and if we squeeze it several times the fish goes up and down. 

In this experiment we see that the water comes out in two different ways from the holes. In the highest one the water goes out further than the lowest one. 

6- BOTTLE WITH ONE HOLE (with cork) 

In this experiment we notice that when the teacher puts the cork the water stops even if the water is higher than the hole, while when she removes the cork it comes out. 

7-SYRINGE WITH FIVE HOLES

In this experiment the teacher uses a syringe with five holes, four of which are made by herself. We notice that if there's water in the syringe and we push the piston, the water comes out from the holes in 5 different ways.

0 means that the answer was incorrect; 

0,5 it is correct but we can do it better; 

1 it's correct; 

1,5 it is correct but something is missing;

2 the answer is perfect. 

We have given high marks but some answers were incorrect so our self evaluation amounted to 0 points. 👎🏻👎🏻👎🏻

Stevin's Law states that the pressure at a point in a liquid in static equilibrium depends only on the depth at that point.

Archimede had to check if a goldsmith had cheated on the king by putting some silver in his crown, which was meant to be of pure gold, in order to take some gold for himself. He knew that silver was less dense than gold so, if the crown was made only of pure gold, it would have been more dense. He decided the compare the crown and some gold coins: considering that density formula is d=m/V, he had to find the volume of the gold coins and the crown. So, knowing that a crown can't be measured in a normal way he put it in water and observed how much water was displaced, because the volume of water spilled is equal to the volume of the immersed object. So in this way he could calculate the density of both objects and then he discovered that the crown wasn't made of pure gold because it was less dense than the gold coins. 

We know that Titanic had been built with 16 compartments, separated by bulkheads below the waterline. The bulkheads were sealed to keep the ship afloat even if all 4 forward compartments were flooded. Unfortunately the additional compartments flooded and the extra weight pulled Titanic low into the water.

As the rear of the ship rose out of the water, the hull broke and Titanic tore into 2 pieces. The forward section broke away and fell to the bottino of the Atlantic. The rear section continued to float upward toward the vertical before also plunging to the bottom of the ocean.