Weighing

[Music] Hello! My name is Dr. Eszter Trufan  and in this video I'm going to demonstrate

how to use a simple scale. For this part of  the experiment, we're going to use this scale,

which is a fairly straightforward instrument. An  instrument is anything that gives us a number for

a measurement. I'm also going to use a weighing  boat. I'm going to use a beaker, and then I have

a lot of spatulas to choose from. There's this  one, for larger amounts, a scoopula, then I have a

spatula for small amounts and very small amounts.  And then I have the disposable versions, here.

To record my mass, I'm also going to use a  solid, here. So, the first thing I'm going

to do is remove the lid from my scale. Turn it on.  I will place the weighing boat on it. Press tare.

It will show 0.00 and this is where I can  begin measuring the amount of material.

I will use, this time, my lab spatula and  place some amount of sugar in my weighing boat.

Because I use the tare function, when I record  the mass of the sugar from the weighing boat,

it will be exactly 1.04 grams. And  this is only the mass of sugar.

Another way to use this scale, is to use some kind  of container and if we keep adding multiple things

into the container that may change their  mass or react with each other over time,

then it is important that we subtract the mass  of the beaker, where we began the experiment.

When we're recording mass by difference, we  want to get the mass of the beaker first. And

so before we even place the beaker on the scale,  we make sure that it is tared, so 0.00, then we

place the beaker on top. And now we record the  mass of the beaker on a separate piece of paper.

Then to measure the amount of sugar  that is added, we're going to use our

spatula, place as much sugar as is needed  into the beaker. It doesn't have to be sugar,

it can be any solid. It would work the same way.  If we added enough, then we're going to stop and

we are going to record the mass of the beaker  and the sugar. To get the mass of the sugar,

we're going to take the mass of the beaker with  sugar and from there, subtract the mass of the

beaker by itself. And that's how we get the  mass of the solid that is inside the beaker.

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