Bar to psi

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<html lang="en-US"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Bar to psi</title><style>*{box-sizing:border-box}body{margin:0;background:#f3f4f2;color:#202c32;font:16px/1.5 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}main{max-width:1120px;margin:auto;padding:30px 28px 60px}header{margin-bottom:22px}.eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;font-weight:750;color:#59676b}h1{font-size:clamp(25px,4vw,36px);line-height:1.15;letter-spacing:-.035em;margin:7px 0 10px}h2{font-size:21px;line-height:1.3;margin:0 0 16px}h3{font-size:17px;margin:0 0 10px}p{margin:8px 0 16px}label{display:block;font-size:14px;font-weight:650;margin:12px 0 5px}input,select,textarea,button{font:inherit}input,select,textarea{width:100%;min-width:0;border:1px solid #b6c0bf;border-radius:7px;background:#fff;color:#202c32;padding:10px 12px}textarea{resize:vertical;min-height:88px}input[type=checkbox]{width:18px;height:18px;vertical-align:middle;margin-right:8px}button{border:1px solid #b8c3c1;border-radius:7px;padding:10px 15px;background:#fff;color:#203632;font-weight:650;cursor:pointer}button.primary{background:#243f3c;color:white;border-color:#243f3c}button:hover{filter:brightness(.95)}button:disabled{opacity:.48;cursor:not-allowed}:focus-visible{outline:3px solid #b05814;outline-offset:3px}.buttons{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}.panel{background:#fff;border:1px solid #d7ddda;border-radius:12px;padding:24px}.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:22px}.row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.result{background:#e4eee8;border:1px solid #c5d6ca;border-radius:12px;padding:28px}.big{font-size:clamp(32px,5vw,56px);font-weight:740;line-height:1.14;letter-spacing:-.04em;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}.muted{color:#59686a;font-size:14px}.tag{display:inline-block;background:#edf0ed;border-radius:4px;padding:3px 8px;font-size:12px;font-weight:700}.error{color:#9d301b;font-weight:650;min-height:24px;margin-top:10px}.note{border-left:3px solid #9a794a;padding:10px 15px;background:#faf5e9;margin:18px 0}.below{margin-top:28px}.record{white-space:pre-wrap;overflow-wrap:anywhere;font:14px/1.65 ui-monospace,SFMono-Regular,Consolas,monospace;background:#f2f4f1;padding:18px;border-radius:8px}table{width:100%;border-collapse:collapse;font-size:14px}th,td{text-align:left;vertical-align:top;border-bottom:1px solid #dce1dd;padding:12px 10px;overflow-wrap:anywhere}th{color:#59686a;font-size:12px}a{color:#2c5a6a;overflow-wrap:anywhere}details{margin-top:20px}summary{cursor:pointer;font-weight:650}hr{border:0;border-top:1px solid #d6dcd6;margin:22px 0}[hidden]{display:none!important}ol,ul{padding-left:23px}.statline{display:flex;gap:20px;flex-wrap:wrap;margin:18px 0}.statline strong{display:block;font-size:24px}.inline{display:flex;align-items:center;gap:8px}.inline label{margin:0} .blank{min-height:36px;border-bottom:1px dashed #aebbb5;color:#66736d;font-size:13px;padding:8px 0}@media(max-width:720px){main{padding:22px 18px 45px}.split{grid-template-columns:1fr}.panel,.result{padding:20px}.row{gap:12px}th,td{padding:10px 6px}}@media(max-width:400px){main{padding:18px 14px 40px}.big{font-size:34px}button{padding:10px 12px}.row{grid-template-columns:1fr}.panel,.result{padding:17px}}</style></head><body><main><header><div class="eyebrow">Pressure worksheet · Preserve the reference</div><h1>Bar to psi</h1></header>
<section class="result"><div class="eyebrow">Converted pressure</div><div class="big" id="answer">≈ 29.007548779 psi</div><p id="reference">Gauge · worksheet supplied</p><div class="statline"><div>Bar<strong id="bar">2</strong></div><div>kPa<strong id="kpa">200</strong></div><div>Pa<strong id="pa">200000</strong></div></div></section>
<form id="form" class="panel below" novalidate><div class="row"><div><label for="quantity">Supplied pressure</label><input id="quantity" value="2" inputmode="decimal"></div><div><label for="unit">Input unit</label><select id="unit"><option value="">Choose a unit</option><option selected>bar</option><option>kPa</option><option>Pa</option></select></div><div><label for="ref">Pressure reference</label><select id="ref"><option value="">Choose a reference</option><option selected>Gauge</option><option>Absolute</option><option>Unknown</option></select></div><div><label for="note">Reference source note</label><input id="note" value="worksheet supplied" maxlength="200"></div></div><div class="buttons"><button type="submit" class="primary">Convert pressure</button><button type="button" id="reset">Reset</button></div><p id="feedback" class="error" role="status"></p></form>
<section class="below panel"><h2>Conversion record</h2><div class="record" id="record"></div><p>NIST tabulates 1 bar = 100000 Pa and 6894.757 Pa per psi. The nine-place psi display is approximate and does not establish measurement precision.</p><p class="muted">Classroom quantities only. The pressure reference carries through unchanged; no atmospheric offset or gauge-to-absolute conversion is applied.</p><a href="https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b9">NIST conversion factors</a></section><footer class="below muted">Local working example · Changes last only while this page is open.</footer></main><script>
const $=id=>document.getElementById(id);const txt=(id,v)=>$(id).textContent=v;const esc=s=>String(s).replace(/[&<>"']/g,c=>({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[c]));const on=(id,event,fn)=>$(id).addEventListener(event,fn);const num=(s,positive=false)=>{s=String(s).trim();if(!/^\d+(?:\.\d{1,6})?$/.test(s)||!Number.isFinite(+s)||+s>1000000||(positive&&+s<=0))throw Error(positive?'Enter a density greater than 0, up to 1,000,000, with at most six decimals.':'Enter a value from 0 to 1,000,000, with at most six decimals.');return +s};const fmt=n=>n!==0&&Math.abs(n)<.000001?n.toExponential(6):Number(n.toFixed(6)).toString();

function psiDisplay(raw,unit){const parts=String(raw).trim().split('.'),digits=BigInt(parts.join('')),scale=10n**BigInt((parts[1]||'').length),f={bar:100000n,kPa:1000n,Pa:1n}[unit];const n=digits*f*1000n*1000000000n,d=scale*6894757n;let q=n/d;if((n%d)*2n>=d)q++;const text=q.toString().padStart(10,'0');return text.slice(0,-9)+'.'+text.slice(-9)}
function pressure(raw,unit,ref){const s=String(raw).trim();if(!/^[0-9]+(?:[.][0-9]+)?$/.test(s)||!Number.isFinite(+s))throw Error('Enter a finite, nonnegative dot-decimal pressure; blank is missing.');const factors={bar:100000,kPa:1000,Pa:1};if(!Object.hasOwn(factors,unit)||!['Gauge','Absolute','Unknown'].includes(ref))throw Error('Choose an input unit and a deliberate reference.');const pa=+s*factors[unit];if(!Number.isFinite(pa))throw Error('Conversion overflow. Use a smaller magnitude.');return {bar:pa/100000,kpa:pa/1000,pa,psi:pa/6894.757,psiDisplay:psiDisplay(raw,unit),ref}}
function clear(){['answer','bar','kpa','pa','reference','record'].forEach(id=>txt(id,'—'));txt('feedback','Inputs changed. Convert to update.')}
function calculate(){clear();try{const r=pressure($('quantity').value,$('unit').value,$('ref').value);txt('answer','≈ '+r.psiDisplay+' psi');txt('reference',(r.ref==='Unknown'?'Reference unknown':r.ref)+' · '+($('note').value.trim()||'Source note not supplied'));['bar','kpa','pa'].forEach(id=>txt(id,String(r[id])+' · '+r.ref));txt('record','Input: '+$('quantity').value+' '+$('unit').value+'; '+r.ref+'\nReference note: '+$('note').value+'\nPa = input × '+({bar:100000,kPa:1000,Pa:1}[$('unit').value])+' = '+r.pa+' Pa\npsi ≈ '+r.pa+' ÷ 6894.757 = '+r.psiDisplay+' psi ('+r.ref+')\nNearest display rounding, nine decimal places; finite tabulated factor.');txt('feedback','Conversion updated. Reference preserved.')}catch(e){txt('feedback',e.message)}}
on('form','submit',e=>{e.preventDefault();calculate()});['quantity','unit','ref','note'].forEach(id=>on(id,'input',clear));on('reset','click',()=>{['quantity','unit','ref','note'].forEach(id=>$(id).value='');clear();txt('feedback','');$('quantity').focus()});window.app={pressure,calculate};calculate();
</script>
<script>
// Local calculation controls: no native form submission or sandbox permissions required.
(()=>{const form=document.getElementById('form');if(!form)throw Error('Calculation form missing');const dispatch=()=>form.dispatchEvent(new Event('submit',{bubbles:true,cancelable:true}));const buttons=[...form.querySelectorAll('button')].filter(button=>button.type==='submit');if(buttons.length!==1)throw Error('Expected one calculation control');for(const button of buttons){button.type='button';button.addEventListener('click',dispatch);}form.addEventListener('keydown',event=>{if(event.key==='Enter'&&!event.isComposing&&['INPUT','SELECT'].includes(event.target.tagName)){event.preventDefault();dispatch();}});})();
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