# Scientific Calculator
### Instructions
## About this calculator
Scientific calculator for chemists with notebook is a fully functioning JavaScript calculator. This calculator can be used as common scientific calculator (sin, cos, log, power, root, memory), but it also includes a molecular weight calculator and the tables with various physical and chemical constants. The calculator contains a list with task history, storing all the recent inputs and results. Scientific calculator displays the numbers rounded to a user-specified number of decimal places.
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Type your expression directly onto the input line or copy and paste an expression from other programs. When you finish entering your expression, press **ENTER** or click [**=**] button.
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## Rules for typing in calculations
- Spaces are irrelevant, for example 54 + 3*2 is equal to 54+3*2
- If you press a function button without argument, the last result becomes a function argument
- If the first character in the expression is a maths operator (+, *, /) then the last result is put in before the maths operator
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## Angle measurements
In trigonometric calculations, angles are interpreted as degrees (default) or radians, depending on mode setting (Deg or Rad mode).
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Results can be rounded to a user-specified number of decimal places (max 15-digit). This calculator can also round the mantissa under scientific notation. For example, numbers are rounded to 4 decimal places like this: decimal number 3.5269, integer number 35269.0000 and scientific number 3.5269 e-31.
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To perform basic mathematical operations use the following arithmetic operators: addition (**+**), subtraction / minus sign (**-**), multiplication (*****) and division (**/**)
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Enter a positive number by pressing the appropriate digit keys (or buttons) and, if necessary, the decimal point key [**.**]. Full stops and commas can both be used as the decimal point in numbers (3,2 + 4.3 = 7.5).
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Negative numbers are obtained by simple putting the minus sign (**-**) before the number.
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Use standard calculator notation for scientific notation, for example 1e-5 is 0.00001; 1e+3 or 1e3 is 1000. Enter the mantissa as the positive or negative number, and then click [**E**] button or just type lower **e** and type exponent as the positive or negative number.
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Operations with the same precedence are performed from left to right, with operations enclosed in brackets performed first. If brackets are nested, the operations enclosed in the innermost set of brackets are performed first. All types of brackets are correct, for example 25.3/(K3[Fe(CN)6]).
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- The element symbols in chemical formula must be properly capitalized.
- For indicating hydration you must use a
**+** sign (CuSO4+5*H2O). - You can type the leading number before formulae without brackets: 3*CO2 is equal to 3*(CO2)
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Clicking the **Constants** button causes a physical constants table to pop up. Click the button next to the constant you want to insert into the calculation.
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2+5-3.25 = 3.75 8+7+(42-16)*3 = 93 8+7+[(42-16)-7]*3 = 72 5*-7 = -35 7e-6/3e-9 = 2333.3333333333 H2SO4 = 98.07848
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