Observation Of Balloon Essay

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It is possible to estimate the quantities of a substance that we need - for example heaped teaspoons. Another common way of estimating is using a fraction of a standard quantity, for example a quarter teaspoon of salt, or half a brick of butter.

Measuring temperature
Temperature is involved in many aspects of our daily lives, including our own bodies and health; the weather and how warmly we must dress; and how hot the stove or oven must be in order to cook food.
Temperature can be negative or positive. The higher the positive temperature, the hotter it is. The lower the negative temperature, the colder it is.

Temperature is measured in degrees Celsius (°C). Water freezes and becomes ice at 0°C and at sea level, it boils at 100°C. A normal temperature for a healthy person is between …show more content…

• 60 seconds = 1 minute
• 60 minutes= 1 hour
• 24 hours = 1 day
• 7 days = 1 week
• 365 days = approximately 52 weeks = 12 months = 1 year

2.1.2 Read scales on the measuring instruments
When reading an instrument, there are three parts that must be reported. The first is the reading itself, called the nominal value of the measurement. The second is the units of the measurement. The third part is to estimate the uncertainty of the reading, due to the resolution of the device. We will refer to this uncertainty as the reading error or resolution error.

The nominal value is the number read directly off the instrument’s display:

For the display of the first figure, we would record 0.30 g.
For the thermometer reading, we see that the reading appears to be 20.2oC

With analogue displays, extra care must be taken to ensure an accurate reading. Because the indicator (the mercury) is behind the scale (the lines on the glass), you must read the instrument with your eye normal to the instrument’s display. Otherwise you risk misreading the instrument, as demonstrated in the figure below. This error is called Parallax

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