- What are the two types of exact numbers?
- What are two ways to determine density?
- Does density affect weight?
- What is difference between density and mass?
- Is density an exact number?
- What is the most densest element?
- What is the least densest element?
- How do you find the accepted density?
- What is density in simple words?
- What factors cause differences in density?
- What is the difference between accuracy and precision?
- Is density dependent on mass?
- Is density a weight?
- What is the most accurate way to measure density?
- What are the densest elements?
- Can osmium kill you?
- Does density change with size?
What are the two types of exact numbers?
1.5 Uncertainty in Measurement In scientific work we recognize two kinds of numbers: exact numbers (those whose values are known exactly) and inexact numbers (those whose values have some uncertainty)..
What are two ways to determine density?
Direct Measurement of Mass and Volume Using a vernier caliper or ruler, measure the length, depth and width of the object in centimeters. Multiply these three measurements to find the volume in cubic centimeters. Divide the object’s mass by its volume to determine its density.
Does density affect weight?
Density is also subject to environmental changes such as pressure and temperature of the objects. If the pressure or temperature is modified, density will be affected. Weight is never altered unless the gravity or mass of the object changes.
What is difference between density and mass?
Mass quantifies the amount of matter present in a certain object that is usually expressed in unit grams or kilograms. … Density quantifies how much mass is present in a certain matter or object with respect to volume (per unit volume). Water, for example, has a density of 1 gm/cm3.
Is density an exact number?
In the last step, we limit our final answer to two significant figures because the volume quantity has only two significant figures; the 1 in the volume unit is considered an exact number, so it does not affect the number of significant figures. … Density can be used as a conversion factor between mass and volume.
What is the most densest element?
element osmiumAt the modest temperatures and pressures of Earth’s surface, the densest known material is the metallic element osmium, which packs 22 grams into 1 cubic centimetre, or more than 100 grams into a teaspoonful.
What is the least densest element?
hydrogenUnder ordinary conditions, the least dense element is hydrogen, while the densest element is either osmium or iridium.
How do you find the accepted density?
The Density Calculator uses the formula p=m/V, or density (p) is equal to mass (m) divided by volume (V). The calculator can use any two of the values to calculate the third. Density is defined as mass per unit volume.
What is density in simple words?
Density is a measure of mass per volume. The average density of an object equals its total mass divided by its total volume. An object made from a comparatively dense material (such as iron) will have less volume than an object of equal mass made from some less dense substance (such as water).
What factors cause differences in density?
The density of an object or quantity of matter is its mass divided by its volume. This is usually measured under standard conditions for temperature and pressure: 0°C and 1 atmosphere of pressure. One factor affecting the density of a material is how concentrated the atoms are in a given volume.
What is the difference between accuracy and precision?
Accuracy refers to how close measurements are to the “true” value, while precision refers to how close measurements are to each other.
Is density dependent on mass?
Density (d) depends upon the mass (m) and volume (v) of a substance. The mass depends upon the amount of matter in a substance, whereas volume is the amount of space that a substance takes up. … Regardless of the type of density, it remains an intensive property.
Is density a weight?
The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton. Density is mass/volume.
What is the most accurate way to measure density?
The Tools Used to Measure DensityScale. Mass is one of the most easily obtained measurements. … Graduated Cylinder. The most accurate way to determine an object’s volume, especially in the case of an irregularly shaped object, is to immerse it in water and measure the amount of water it displaces. … Calculating Density. … Hydrometer. … The Value of Density.
What are the densest elements?
As it turns out, either of two elements can be considered the element with the highest density: osmium or iridium. Both osmium and iridium are very dense metals, each weighing approximately twice as much as lead.
Can osmium kill you?
Osmium Tetroxide is lethal and can be bought on the internet for less than £17 a gram, but experts say it is not as dangerous as the sarin gas unleashed on the Tokyo subway in 1995 which killed 12 and injured 6,000.
Does density change with size?
Density is an intensive property. This means that regardless of the object’s shape, size, or quantity, the density of that substance will always be the same.