BBC Bitesize - GCSE Physics (Single Science) - Density - Revision 1
Explain how to measure the volume of an irregular shaped object if it floats in water. way to measure the volume of a solid provided that the solid does not dissolve in water and that it does not float. level with the heavy object holding the floating object down under the water. 1 educator answer; What is a unit of mass?. Learn about calculating the densities of solids, liquids and gases with BBC Bitesize of any solid, liquid or gas is to divide its mass in kilograms by its volume (length A eureka can is a container large enough to hold the object with a spout. Objectives: Name. Use a balance to determine the mass of regularly and irregularly-shaped objects. Use water displacement and direct.
Communication is the process of composing, sending, and receiving messages using technological devices.
Determining the Density of a Solid and Liquid | Protocol
Compounds may only be broken down into simpler types of matter elements by chemical means. Construction is the process of turning materials into useful structures. Construction is the process of turning raw materials into useful structures.
Creating optimal solutions under constraints are a primary component of technological problem solving e. Decisions about the use of products and systems can result in expected and unexpected consequences. Decisions about the use of products and systems can result in known and unexpected consequences.
Elements are the basic building blocks of matter that cannot be broken down chemically and are made up all of the same type of atoms. Energy and power technologies are the processes of converting energy sources into useful power.
Energy and power technologies use processes to convert energy into power. Friction is an example of an electromagnetic force that opposes motion between two surfaces.
Human decision making e. In a technological world, inventions and innovations must be carefully assessed by individuals and society as a whole. Innovation is the process of improving an existing product, process, or system. Innovation is the process of modifying an existing product, process, or system to improve it.
Invention is a process of creating new products, processes, or systems. Invention is a process of turning ideas and imagination into new products, processes, or systems.
Inventions and innovations must be carefully assessed by individuals and society. Manufacturing is the process of turning materials into useful products.
- Density of materials
Manufacturing is the process of turning raw materials into useful products. Mass is a measure of the amount of matter in an object. You can just weigh something on a scale. So the trick is to find the volume V of the irregularly shaped object. As Tom wrote earlier, there's a way to do this. Mark the level of the water. As the object goes into the water, it will force the water up in the container. Mark the level of the water when the object is completely under.
Now take the object out. You can pour water in from a measuring cup say one marked in liters to see how much is needed to fill from the lower mark to the upper mark.
That volume is the same as the object's volume. According to legend, Archimedes figured all this out in the third century B. While taking a bath Archimedes noticed the water level rising when he got into the tub.
He got the idea of how to measure density and, again according to legend, was so elated with his discovery he ran naked down the street shouting 'Eureka, I have found it'. Mike's explanation is an example of what is now called 'Archimedes Principle'. How to find the density of an irregular object? What a fun question! The Greek mathematician Archimedes is said to have faced a similar problem when he was asked by King Hiero II to determine whether or not the king's new crown had been made with pure gold, as requested.
Of course, the easiest course of action would be to melt the crown down to a less irregular shape and compare its mass to its volume, but Archimedes couldn't do that with something as valuable as a crown! Weigh the cylinder, water, and zinc pellets on the balance. Record the mass of the zinc pellets. For best results, repeat steps 2. Density, defined as a substance's mass per unit volume, is an important physical property for characterizing a material or chemical system.
Determining the Density of a Solid and Liquid
To obtain the density of a substance, its mass and volume are determined by measurement. This video will introduce the principles of density determination, the procedures for calculating the density of both solid and liquid substances, and some applications of density in scientific research. All matter has mass, and that mass occupies a specific volume.
However, the volume of space occupied by the same mass is different for different substances, depending on their respective density. For example, a ton of bricks has the same mass as a ton of feathers, but occupies considerably less volume.Measuring the volume of an irregular object
Density is obtained by dividing mass by volume. Mass can be measured with scales or balances, and is expressed in grams or kilograms. By convention, the volume of liquids and gases is often expressed in units of liters or milliliters, measured with glassware.
The dimensions of regularly shaped solids can be measured directly with rulers or calipers, which have linear units, giving volumes in units such as cubic centimeters. One milliliter is equivalent to one cubic centimeter.
The dimensions of irregularly shaped solid samples cannot be easily measured. Instead, their volumes can be determined by submerging the solid in a liquid. The volume of the submerged solid is equal to the volume of liquid displaced.
Now that you understand the concept of density, let's take a look at two protocols for accurately determining the density of a liquid and a solid. To begin this procedure, place a clean and dry mL volumetric flask on an analytical balance.
After the measurement has stabilized, tare the balance. The balance should read zero. Use a funnel to add approximately 45 mL of liquid to the flask. Do not fill to the calibration mark. Use a Pasteur pipette to carefully add the final 5 mL of liquid, just until the bottom of the liquid's meniscus touches the line on the flask.
Weigh the flask again and record the mass of the liquid. Repeat the measurements at least twice to obtain additional values to calculate an average density. The results are shown in this table.
The average measured density was 0. To determine the density of an irregular solid in pellet form, add approximately 40 mL of water to a clean and dry mL graduated cylinder. Record the exact volume. Place the cylinder on an analytical balance and tare. Add approximately 10 pellets, and record the new volume after the addition.