Urgent: Typing a simple equation

Question

Requesting help urgently... Would anyone please be able to let me know a way to type this simple equation in Latex, properly, without the obvious errors? I have used the following code (please see the code below), however, it produces the output with some obvious errors (please see the output image attached) such as;

1. the entire equation is in italics and another font. Should be changed to regular Times New Roman text 12pt, non-italicized.
2. words are conjoined. In the code, the words are separated, however that does not translate to the output and all words are joined together. How can I change the code to add space between two words? these should be not conjoined.

The code is here;

\begin{equation}
\underset{[\mathrm{Cells/uL}]}{Absolute Count} = \frac{Cell Count \times eBead Volume}{eBead Count \times Cell Volume} \times eBead Concentration
\end{equation}

Thank you so much.

Answer 1

I'm not sure such formulas are meaningful. Anyway, you want to use text and not math for the words.

And microliters, not uL.

\documentclass{article}
\usepackage{amsmath}
\usepackage{siunitx}
\begin{document}
\begin{equation}
\underset{[\mathrm{Cells/\unit{\micro\liter}}]}{\textup{Absolute Count}} =
\frac{\textup{Cell Count} \times \textup{eBead Volume}}
     {\textup{eBead Count} \times \textup{Cell Volume}}
\times \textup{eBead Concentration}
\end{equation}
\end{document}

If you want to change the global document font to Times

\documentclass{article}
\usepackage{newtxtext,newtxmath}
\usepackage{amsmath}
\usepackage{siunitx}
\begin{document}
\begin{equation}
\underset{[\mathrm{Cells/\unit{\micro\liter}}]}{\textup{Absolute Count}} =
\frac{\textup{Cell Count} \times \textup{eBead Volume}}
     {\textup{eBead Count} \times \textup{Cell Volume}}
\times \textup{eBead Concentration}
\end{equation}
\end{document}

Answer 2

There is no Times New Roman in native LaTeX. The closest you can get by loading mathptmx (see: How to set document font to times new roman by command)

You can add text in a math formula by the command \text. See the code below.

\documentclass[12pt]{article}
\usepackage{amsmath}
\usepackage{mathptmx}
\begin{document}
\begin{equation}
    \underset{\text{Cells/uL}}{\text{Absolute Count}} = \frac{\text{Cell Count};  \times; \text{eBead Volume}}{\text{eBead Count} ; \times ; \text{Cell Volume}} ; \times; \text{eBead Concentration}
\end{equation}
\end{document}