I did not and could not keep my promise to make up for all the days i missed. I am sorry. I'm not sure who I
'm apologizing to. Probably myself. Oh well. let's get on to my studying. Measuring Mass and stuff.Since I can't remember simple things let me review what I learned last time
Matter is anything made up of atom. Everything is made of Matter.
Elements are the building blocks of matter and are formed of only one type of atom
Compounds are made of two or more elements and can only be seperated through a chemical reaction.
Mixtures:are a mix of two or more substances that can be separated quite easily.
A subsscript is the ratio of...something
Now that I know very basic science *pats myself on the back* We can keep going
MASS is often confused with weight. Mass is how much matter an object contains
Back to Mass. In Science, Mass refers to one of the three properties of matter
Inertial Mass- is basically measured the an objects resistance to acceleration
*You may recall that Inertia is the resistance of an object to a change in movement. This relates to a moving objects resistance to stopping and an objects resistance to moving.
Then there is
Active Gravitational Mass-Well.....I'm not really sure what this is. Apparently it is a fact that there is a difference between Active and Passive Gravitational Mass but there is no reason why there should be a difference. I'm guessing that Gravitational mass is the most common mass that I told you about earlier
The difference between mass and weight is that gravity does not affect your mass. if you are in space your weight is different because Weight is simply a measure of how much force gravity is pressing down on you. Mass is simply how much matter you contain. This is also why you would eigh differently on another planet but your mass wouldn't change. NEVER CONFUSE MASS AND WEIGHT.
THE METRIC SYSTEM or the INTERNATIONAL SYSTEM (SI) is how scientists measure properties of matter
The SI unit for mass is the Kilogram
Other units for Mass :
Gram
Milligram
VOLUME is the amount of space an object occupies. Whereas Mass is how much mass something is Made of this is How much space it takes up.
HeightxLengthxWidth= the Volume of a rectangular object
Si Unit for Volume is a Cubic Meter or sometimes just a Meter
DENSITY is sometimes defined as how much mass per unit of volume but other times it is defined as how much weight per unit of Volume
A kilogram of bricks takes up less space than a kilogram of feathers because the bricks are denser and more mass is packed into each unit of volume
You can calculate density by dividing volume from mass. D=M/V
One unit of density is g/cm3 or grams per cubic centimeter
If I am correct the density of a liquid is usually grams per milliliter
The reason wood floats and gold doesn't is that the wood has less density. This is also the reason a steel boat will float and a bar of steel won't. It depends on how much water it can displace. I will get to that later.
Pop Quiz: Does the density of a substance change, depending on the sample of the substance.
A: FALSE. The Density does not change no matter what amount it is.
Stay tuned for PARTICLES OF MATTER where we will learn about
Early ideas About Atoms
John Dalton
Atoms and Molecules
Ideas About Atoms: Past and Present
The Composition of an Atom
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