☼Helium is lighter then the air around us so it floats,that`s why it is perfect for the balloons.
☼Hydrogen is the first element of periodic table.It is highly flammable and is the most common element found in the universe.It`s atomic number is 1.It doesn`t help other element to burn but it burn it self.
☼Although it is still debated,it is largely recognized that the word "Chemistry" comes from an Egyptian word meaning "Earth".
☼water from a sea or ocean is known as seawater.On average,every kilogram of seawater contains around 35 grams of dissolved salt.
☼Hydrogen is the first element of periodic table.It is highly flammable and is the most common element found in the universe.It`s atomic number is 1.It doesn`t help other element to burn but it burn it self.
☼Although it is still debated,it is largely recognized that the word "Chemistry" comes from an Egyptian word meaning "Earth".
☼water from a sea or ocean is known as seawater.On average,every kilogram of seawater contains around 35 grams of dissolved salt.
☼ Around 1% of sun`s mass is Oxyzen.
☼Drinking water is needed for human to avoid dehydration,the amount you need each day depends on the temperature.
☼Some types of bamboo can grow nearly a metre a day!
