take three similar milk bottles and fill one of them with kerosene oil,one with water and one with any other vegetable oil. fixsoda straw in them with help of cork and mark the level of each liquid in soda straw. place the bottle in trough .pour hot water in the trough. watch the level of each after few minutes what do you observe.list your observation with suitable reasonl.

which type of glass dont break why they dont break?

When you conduct this experiment with three different liquids—kerosene, water, and vegetable oil—you'll observe some interesting behaviors related to density and thermal expansion. Let’s break down what happens step by step, and then we’ll discuss why certain types of glass are more resistant to breaking under heat.

Setting Up the Experiment

In your setup, you have three bottles filled with different liquids: kerosene, water, and vegetable oil, each with a soda straw fixed in place. The straws allow you to observe the liquid levels as you heat the surrounding water in the trough.

Observations After Heating

• Water: As the hot water heats the bottle containing water, you will notice that the water level in the straw rises. This is due to thermal expansion; as water heats up, it expands and takes up more space.
• Kerosene: The kerosene will also show a rise in the straw level, but it may not rise as much as the water. Kerosene has a lower density than water, and its thermal expansion is slightly different.
• Vegetable Oil: Similar to kerosene, the vegetable oil will rise in the straw, but the extent of the rise will depend on the specific type of oil used. Generally, oils have a lower thermal expansion coefficient compared to water.

Reasons Behind the Observations

The differences in liquid levels can be attributed to two main factors: density and thermal expansion. Water has a higher thermal expansion rate compared to oils and kerosene, which is why you see a more significant rise in the straw. Kerosene and vegetable oil, being less dense, will expand but not as dramatically as water.

Understanding Glass Types and Their Resistance to Breaking

Now, regarding the type of glass that doesn’t break easily under heat, tempered glass is a prime example. Tempered glass is manufactured through a process of extreme heating and rapid cooling, which increases its strength. Here’s why it withstands thermal stress:

• Internal Stresses: The rapid cooling creates compressive stresses on the surface of the glass, making it more resistant to thermal shock.
• Uniform Thickness: Tempered glass is usually made with uniform thickness, which helps distribute heat evenly, reducing the risk of breakage.
• Safety Features: If tempered glass does break, it shatters into small, blunt pieces rather than sharp shards, making it safer.

In summary, your experiment illustrates the principles of thermal expansion and density, while the discussion on glass highlights the importance of material properties in everyday applications. Understanding these concepts not only enhances your scientific knowledge but also helps in practical situations, such as choosing the right materials for specific tasks.