Explanation

• Thermometer is the instrument used to measure temperature.
• It is a device that measures the temperature of a substance or environment, typically consisting of a glass tube filled with a liquid that expands or contracts in response to changes in temperature.

Explanation

• The percentage of Oxygen in the air is: 21.94%
• ***
• The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen.
  
• Air also has small amounts lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
• ***
• Without oxygen, brain damage is likely after 04-05 mins.
• Joseph Priestly discovered oxygen on August 1, 1774.
• The most abundant element in the Earth's crust is oxygen, making up 46.6% of Earth's mass

Explanation

Magnetic property: Thorium is a ferromagnetic metal, meaning it is capable of being magnetized.

Radioactive property: Thorium is also a radioactive metal, emitting alpha, beta, and gamma radiation due to its unstable atomic nucleus.

Explanation

Rusting of iron is a chemical reaction where iron reacts with oxygen and water to form iron oxide (rust).

Unlike physical changes like melting or bending, rusting involves a chemical transformation.

Explanation

The element required for solar energy conversion is silicon.

Silicon is the most common semiconductor material: Silicon is used in about 95% of solar cells sold today. 

Silicon is a naturally occurring element: Silicon is the second most abundant element on Earth, after oxygen.