Moses Joshua Montilla, Jared Paolo Nacino, Daryl Janus Panganiban, Matthew Allan Papa

Department of Sports Science

College of Rehabilitation Science, University of Santo Tomas

España, Manila Philippines

Abstract

The experiment about relative density is composed of three different activities. The first activity is about the Displacement Method for alloy, the second activity is about getting the density of a bone and the third activity is about Regular versus Diet Soft Drinks.

1. Introduction

Relative density is the ratio of the density (mass per unit volume) of a substance to the density of a given reference material. The theory or the principle that we used for the experiment is the Archimides’ Principle which states that any fluid a buoyant force to an object that is partially or completely immersed in it; the magnitude of the buoyant force equals the weight of the fluid that the object displaces. In the experiment we used different formulas. For activity 1 (g) mass of the substance which is Aluminum, (cc) initial level of water, (g/cc) for the experimental value, magnitude of buoyant force [pic]= Wfluid which is weight of displaced fluid. For activity 2 we used formulas for getting the relative density of the bone.

[pic]

[pic]

For experiment 3 we used formulas like

[pic]

2. Theory

Activity 1: Displacement Method for Alloy
The Aluminum bar was weighed and its mass was recorded. Some water was placed into a graduated cylinder and the initial water level was recorded. The Aluminum bar was placed inside the cylinder and the new water level was recorded. The volume of the Aluminum bar was computed by subtracting the initial water level from the resulting water level. The density of the Aluminum bar was computed by dividing its mass by its volume. The calculated density was compared to the standard density (2.7 g/cc) and the % error was taken....

...Experiment 6: RelativeDensity
Laboratory Report
Jessica Manansala, Nathaniel Martinez,
Maria Pacia, Jeanelle Pedrigal, Miguel Poblete
Department of Math and Physics
College of Science, University of Santo Tomas
España, Manila Philippines
Abstract
The experiment would introduce us to 3 concepts, namely, the definition of relativedensity, the Archimedes principle and the determination of density by the Archimedes principle. In the first activity, we were tasked with finding the density of a cylinder of a known metal; this was done by submersing the cylinder of metal in a measured amount of water and calculating the displaced water against the measured mass of the cylinder. The next activity required us to compute for the density of a given bone. The bone was first weighed, submersed in water and then weighed again. After which the relativedensity was then computed. The third activity required us to measure the weights of diet and regular soft drinks and then compute for their density.
Introduction
Relativedensity, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Specific gravity usually means relativedensity with respect to water. The term...

...Experiment Title : Determination of relativedensities and water absorption of coarse aggregates.
Objective : To determine the relativedensities and water absorption of a coarse aggregate. Description of Sample : The sample used was naturally occuring riverside aggregate and was left to soak for 24 hours prior to the experiment. Apparatus Required A pycnometer – a pycnometer is a litre glass jar which has a conical screw on it's lid, and a small aperature at the apex of the conical lid. The use of a pycnometer allows the same volume to be measured repeatedly. ● An electronic mass balance ● A water bottle ● A pan ● An oven
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Procedure
This experiment was carried out under conditions of constant temperature.
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The masses of an empty clean and dry pycnometer and pan were measured.
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The pycnometer was carefully filled with water until an upward meniscus is formed in the aperture. Surplus water was then removed to produce a downward meniscus.
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Then the mass of the water filled pycnometer was measured using the electronic mass balance. This value was then recorded.
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The sample of gravel was then added to the pycnometer until it took up roughly 60% of the pyncometer. The remaining 40% being occupied by water.
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The outside of the pycnometer was then dried thoroughly using tissue paper and then weighed using the balance. The mass was then recorded.
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The aggregate gravel was then removed,...

...about the concentration of solutions of various materials such as brines, sugar solutions and acids. There are many apparatuses that can be used to determine specific gravity depending on the material to be measured. The objectives of this experiment is to make acquainted the different instruments used to measure specific gravity and report measurements and calculations accurately. The materials used in this experiment are: pycnometer, Leach pycnometer, Baumme Hydrometer and Mohr Westphal balance. Specific Gravity of each material are then calculated using the values obtained.
Guide Questions:
1. Differentiate specific gravity and density.
Specific gravity is the ratio of a material's density with that of water at 4 °C where it is most dense and is taken to have the value 999.974 kg·m-3) and is therefore a relative quantity with no units. Density is defined as mass per unit volume; it has the SI unit kg·m-3 and is an absolute quantity.
2. If 54.96 mL of oil weighs 52.78g. What is its specific gravity?
SG= 52.7854.96
=0.9603
3. A pycnometer weighs 50.00g. When filled with water it weighs 100.00 g when filled with oil, it weighs 94.00 g. Determine the specific gravity of oil.
Empty pycnometer(A)= 50.00 g
Pycnometer with water (B)= 100.00g
Pycnometer with oil (C)= 94.0
Specific Gravity=
C-AB-A
94.00g-50.00 g100.00g-50.00 g
44.00 g50.00 g= 0.8800
4. an insoluble powder weighs 12.00g. A pycnometer...

...Abstract
In Measuring and Understanding Density, several experiments were performed to find density of regularly shaped objects, irregularly shaped objects, liquids and gasses. An additional experiment was done to find the specific gravity of a sampling of liquids. The purpose of the experiment was to provide a better understanding of density and to be able to extrapolate unknowns based upon these calculations. The experiments yielded data in keeping with Kinetic-molecular theory in regards to the density of water versus its temperature. Key measurements and formulae were also used to determine densities of metal and plastic objects as well as irregularly shaped rocks. It is possible to find the density of an object (be it liquid, gas or solid) by the use of only a select few measurements and the formulae contained herein.
Introduction
In observing oil floating on water one unknowingly observes a difference in density. Encyclopedia Britannica describes density as offering “a convenient means of obtaining the mass of a body from its volume or vice versa.” Density calculations are used in a number of ways that impact daily life. They are used in the preparation of ballistics gelatin for testing the actual damage a bullet might do to a human body in order to provide information to forensic scientists (C.J.Shepherd et.al. 2009)....

...Lab #2 Determination of Density
Britney Williams
Chemistry 121
Dr. Yu
1/29/13
Purpose: To determine the densities of aluminum and zinc cylinders
Density is the relationship between the mass of an object and its volume. Sometimes density can be easy to sense. If two objects have exactly the same shape and size, the denser one may feel heavier. If their densities are close together, it can be hard to tell the difference. It gets really tough if you are dealing with materials that have very different sizes or very different shapes. The only way to decide the density of an object is to measure its mass and its volume, then divide. Ex. Density= Mass/Volume
Procedure:
For Aluminum:
1. Weigh the aluminum cylinders individually on the analytical balance to the nearest 0.0001g and record the weights
2. With a vernier caliper, measure the diameter of each cylinder to the nearest 0.01cm and record
3. Again, using the vernier caliper, measure the length of each cylinder to the nearest 0.01cm and record
4. Compute the volume of each cylinder by using the formula V= (3.14d2h)/4
For Zinc:
1. Weigh the zinc cylinders individually on the top loading balance to the nearest 0.01g, and record the weights
2. Place enough water in a 100mL graduated cylinder to cover the object. Record the volume of water to the nearest 0.1mL by reading the bottom of the meniscus
3....

...Lab Report
Question- Why do few objects float in water where as others sink?
Hypothesis- I think the objects that have a greater density than water will sink. So whichever object has a density more than 1g/cm³ will sink in water. This is known as relativedensity where the density of the substance is compared to the density of water. Hence, the object that has a greater mass: volume ratio than water will sink.
Materials-
* 1 measuring cylinder
* 1 rectangular prism
* 1 ball of plasticine
* 1 cylinder
* 1 cube
* 1 micrometer
* 1 vernier calliper
* 1 balance
Variables-
Independent- The object that was used
Dependent- The density of the object
Controlled- The water in the measuring cylinder
Procedure-
1. Get the 4 objects (rectangular prism, ball of plasticine, cylinder, and cube) that you’re going to experiment with.
2. Measure the mass of the rectangular prism by weighing it on the balance. Weigh it three times to get an accurate measurement. Then find the measurements of the length, width, and height using a vernier calliper. Use the formula l× b× h to find the volume. Divide the mass by the volume to get the density.
3. Measure the mass of the plasticine by weighing it on the balance. Weigh it three times to get an accurate measurement. Now fill up the measuring cylinder to a certain level and note it down....

...Density: Using Experimental Techniques to Solve an Inquiry based problem
ABSTRACT
The topic of this experiment is Density. The objective is to find two ways in which the density of a given object can be determined, and to find out which of the two ways is more accurate and hence better to use in such a case. The two methods used in this experiment are finding the dimensions of the object and water displacement. These are two ways of finding the volume of an object, and they were chosen since the density of an object may be found using its mass and its volume. The experiment yielded two different density values, however when error analysis was conducted, the water displacement method was proven to be more accurate.
INTRODUCTION
Density by definition is the measure of the amount of matter contained in a substance per unit volume of that substance. This tells how compact the matter in the substance is. Density is very important in everyday life as mass and volume alone are not good enough in comparing different substances or objects. For example, 10 kilograms of cotton and 10 kilograms of iron would definitely have the same mass (10 kilograms) but the cotton would have an extremely larger volume than the iron because the matter contained in iron is more closely packed, and thus it will occupy less space than that of the cotton. Density has become the key to...

...Density Lab Report
PURPOSE:
a. To measure the masses and volumes of solids and liquids
b. To calculate the densities of solids and liquids
c. To calculate the specific gravities of solids and liquids
d. To calculate the volume of a rectangular object and to express the volume in volume metric units
e. To record data and calculate the values in the correct number of significant figures
MATERIALS:
10 mL graduate balance test tube rack unknown liquid
50 mL graduate test tube 100 mL beaker assorted solid objects
Dropper pipette meter stick
PROCEDURE:
Part A. Density of Water
1. Measure the mass of a 100 mL beaker to the nearest .01 g. The beaker should be dry.
2. Measure, as accurately as possible, 50.0 mL of water. Use the graduated cylinder (the bottom of the meniscus must be on the 50 mL mark. You may want to use the dropping pipette to add the last few drops of water to get exactly 50.0 mL). Add this measured volume of water to the 100 mL beaker.
3. Measure the mass of the beaker and the water. Record all measured values in the data chart for Part A of the observation section of your lab report.
All of the data charts should have two columns, one for the item measured and one for the value. The data chart for Part A should contain the following information: (*refers to calculated or theoretical values)
A. Mass of the empty beaker D. *Mass of the water G....